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Marro M, Moccozet L, Vernez D. A numerical model for quantifying exposure to natural and artificial light in human health research. Comput Biol Med 2024; 171:108119. [PMID: 38367446 DOI: 10.1016/j.compbiomed.2024.108119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 01/24/2024] [Accepted: 02/04/2024] [Indexed: 02/19/2024]
Abstract
Various skin and ocular pathologies can result from overexposure to ultraviolet radiation and blue light. Assessing the potential harm of exposure to these light sources requires quantifying the energy received to specific target tissue. Despite a well-established understanding of the light-disease relationship, the quantification of received energy in diverse lighting scenarios proves challenging due to the multitude of light sources and continuous variation in the orientation of receiving tissues (skin and eyes). This complexity makes the determination of health hazards associated with specific lighting conditions difficult. In this study, we present a solution to this challenge using a numerical approach. Through the implementation of algorithms applied to 3D geometries, we created and validated a numerical model that simulates skin and ocular exposure to both natural and artificial light sources. The resulting numerical model is a computational framework in which customizable exposure scenarios can be implemented. The ability to adapt simulations to different configurations for study makes this model a potential investigative method in human health research.
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Affiliation(s)
- Michele Marro
- University of Geneva, Centre Universitaire d'informatique, Battelle, Batiment A, 7 Route de Drize 1227 Carouge (CH), Switzerland.
| | - Laurent Moccozet
- University of Geneva, Centre Universitaire d'informatique, Battelle, Batiment A, 7 Route de Drize 1227 Carouge (CH), Switzerland.
| | - David Vernez
- University of Lausanne, Center for Public Health and Primary Care Medicine (Unisanté), 44 Rue du Bugnon 1011 Lausanne (CH), Switzerland.
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2
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Schmalwieser AW, Lohr MA, Daly SM, Williams JD. Modeling acute and cumulative erythemal sun exposure on vulnerable body sites during beach vacations utilizing behavior-encoded 3D body models. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2023; 22:1-20. [PMID: 36028652 DOI: 10.1007/s43630-022-00293-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 08/16/2022] [Indexed: 01/12/2023]
Abstract
Vacationers in a high-solar-intensity beach setting put themselves at risk of ultraviolet radiation (UV) over-exposure that can lead to acute and chronic health consequences including erythema, photoaging, and skin cancer. There is a current gap in existing dosimetry work on capturing detailed time-resolved anatomical distributions of UV exposure in the beach vacation setting. In this study, a radiative transfer model of the solar conditions of Tampa Bay, St. Petersburg, Florida, USA (27.8°N, 82.8°W) is combined with an in silico three-dimensional body model and data on typical beach vacation behaviors to calculate acute and cumulative body-site-specific UV exposure risk during a beach vacation. The resulting cumulative UV exposure calculated for a typical mix of clothing choices, settings, and activities during a week-long (7-day) beach vacation is 172.2 standard erythemal doses (SED) at the forearm, which is comparable with the average total annual UV exposure of European and North American residents and consistent with existing dosimetry studies. This model further estimates that vacationers choosing to spend a full day exclusively in the beach or pool setting can experience UV exposure in excess of 50 SED a day at multiple body sites. Such exposure indicates that significant sun protective measures would be required to prevent sunburn across all skin types in this setting. This work clarifies the significant role that beach vacations play in UV exposure and corresponding acute and cumulative health risks and highlights the importance of behavioral choices (including clothing, activity and photoprotection) as crucial factors in differentiating personal solar exposure risks.
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Affiliation(s)
- Alois W Schmalwieser
- Unit of Physiology and Biophysics, University of Veterinary Medicine, Veterinaerplatz 1, 1210, Vienna, Austria.
| | | | - Susan M Daly
- Johnson and Johnson Consumer Inc., Skillman, NJ, USA
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3
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Marro M, Moccozet L, Vernez D. Assessing Human Eye Exposure to UV Light: A Narrative Review. Front Public Health 2022; 10:900979. [PMID: 35875046 PMCID: PMC9300719 DOI: 10.3389/fpubh.2022.900979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 04/22/2022] [Indexed: 11/13/2022] Open
Abstract
Exposure to ultraviolet light is associated with several ocular pathologies. Understanding exposure levels and factors is therefore important from a medical and prevention perspective. A review of the current literature on ocular exposure to ultraviolet light is conducted in this study. It has been shown that ambient irradiance is not a good indicator of effective exposure and current tools for estimating dermal exposure have limitations for the ocular region. To address this, three methods have been developed: the use of anthropomorphic manikins, measurements through wearable sensors and numerical simulations. The specific objective, limitations, and results obtained for the three different methods are discussed.
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Affiliation(s)
- Michele Marro
- Computer Science Center, University of Geneva, Geneva, Switzerland
| | - Laurent Moccozet
- Computer Science Center, University of Geneva, Geneva, Switzerland
| | - David Vernez
- Center for Public Health and Primary Care Medicine (Unisanté), University of Lausanne, Lausanne, Switzerland
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4
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Marro M, Moccozet L, Vernez D. Modeling the protective role of human eyelashes against ultraviolet light exposure. Comput Biol Med 2021; 141:105135. [PMID: 34959113 DOI: 10.1016/j.compbiomed.2021.105135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 11/27/2021] [Accepted: 12/10/2021] [Indexed: 11/17/2022]
Abstract
The role of eyelashes in ocular radiation protection has been hypothesized for some time. There is however no quantitative knowledge of the shading they provide. The ocular protection provided by eyelashes is investigated in this study. A numerical model able to simulate an arbitrary source of light to illuminate a 3-dimensional head model with realistic details was used for this purpose. The eyelashes' filtering effect was studied for various light incidence angles, diameter and density of cilia. Using average values provided by literature to define their characteristics, we found that eyelashes reduce ultraviolet light received by the cornea by about 12-14%, with maximum values of 24%. These results suggest that the eyelashes can be an important element of the human eye protection system and their role should be further investigated.
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Affiliation(s)
- Michele Marro
- University of Geneva, Centre Universitaire d'informatique, Battelle, Batiment A, 7 Route de Drize, 1227, Carouge, CH, Switzerland.
| | - Laurent Moccozet
- University of Geneva, Centre Universitaire d'informatique, Battelle, Batiment A, 7 Route de Drize, 1227, Carouge, CH, Switzerland.
| | - David Vernez
- University of Lausanne, Center for Public Health and Primary Care Medicine (Unisanté), 44 Rue du Bugnon, 1011, Lausanne, CH, Switzerland.
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5
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Schmalwieser AW. Possibilities to estimate the personal UV radiation exposure from ambient UV radiation measurements. Photochem Photobiol Sci 2021; 19:1249-1261. [PMID: 32794538 DOI: 10.1039/d0pp00182a] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
People are exposed to solar ultraviolet radiation (UVR) throughout their entire lives. Exposure to UVR is vital but also poses serious risks. The quantification of human UVR exposure is a complex issue. Personal UVR exposure is related to ambient UVR as well as to a variety of factors such as the orientation of the exposed anatomical site with respect to the sun and the duration of exposure. This is mainly determined by personal behaviour. A variety of efforts have been made in the past to measure or model the personal UVR exposure of people and often personal UVR exposure has been expressed as the percentage of ambient UVR. On the other hand, ambient UVR is being monitored at a variety of places and measurements are available even online. This suggests that both the knowledge of personal UVR exposure and measurements of ambient UVR is required. In this paper, a summary on the different methods, which use ambient UVR measurements to estimate personal UVR exposure of people, as well as a few examples, are given. Advantages and disadvantages will be discussed as well as possibilities and limitations. This also includes an overview of appropriate terminology, units and basic statistic parameters to describe personal UVR exposure.
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Affiliation(s)
- Alois W Schmalwieser
- Institute of Biophysics and Physiology, University of Veterinary Medicine, Vienna, Austria.
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6
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Vuilleumier L, Harris T, Nenes A, Backes C, Vernez D. Developing a UV climatology for public health purposes using satellite data. ENVIRONMENT INTERNATIONAL 2021; 146:106177. [PMID: 33189989 DOI: 10.1016/j.envint.2020.106177] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 09/30/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
The effects of solar ultraviolet (UV) radiation on life on Earth differ greatly. While overexposure to UV rays is harmful, small amounts of exposure are necessary for the synthesis of Vitamin D and good health. To optimize individual exposure to solar UV, it is therefore crucial to use UV data sources representative for entire populations and realistically accounting for various influencing factors. A UV climatology for Switzerland based on satellite data has been developed to provide risk estimates at population level. An algorithm generating ground-based radiation estimate has been transformed from the visible to the UV wavelength domain by adapting both a clear-sky radiation transfer model and a cloud modification factor model using satellite imagery. The algorithm allows the computation of global UV erythemal irradiance at a spatial resolution of 1.5 - 2 km and an hourly temporal resolution over fifteen years. A validation, conducted with measurements from three meteorological stations over ten years, showed that the expanded uncertainty for low hourly UVI values (UVI < 3) is about ± 0.3, while for high hourly UVI values (UVI > 6) it can go up to ± 1.5. In clear-sky situation, the uncertainty is in the range of 10-15%. The climatology developed allows to visualise potential UV exposure at regional and national scale. National prevention intervention could use new strategies to better focus on populations at risk and better tailor available researches. The UV climatology allows a high versatility in adapting the data extraction to the goal of studies using it. Further tailored data extraction and analysis will be necessary to exploit this climatology in a wide range of environmental and occupational health applications. Its development was focused on Switzerland, but the techniques used can be extended globally.
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Affiliation(s)
- Laurent Vuilleumier
- Federal Office of Meteorology and Climatology (MeteoSwiss), Payerne, Switzerland.
| | - Todd Harris
- Laboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil and Environmental Engineering, Swiss Institute of Technology, Lausanne, Switzerland.
| | - Athanasios Nenes
- Laboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil and Environmental Engineering, Swiss Institute of Technology, Lausanne, Switzerland; Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas, Patras, Greece.
| | - Claudine Backes
- Center for Public Health and Primary Care Medicine (Unisanté), University of Lausanne, Switzerland.
| | - David Vernez
- Center for Public Health and Primary Care Medicine (Unisanté), University of Lausanne, Switzerland.
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7
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Cheng W, Brown R, Vernez D, Goldberg D. Estimation of Individual Exposure to Erythemal Weighted UVR by Multi-Sensor Measurements and Integral Calculation. SENSORS 2020; 20:s20154068. [PMID: 32707787 PMCID: PMC7435697 DOI: 10.3390/s20154068] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/14/2020] [Accepted: 07/19/2020] [Indexed: 02/07/2023]
Abstract
Ultraviolet radiation (UVR) can be hazardous to humans, especially children, and is associated with sunburn, melanoma, and the risk of skin cancer. Understanding and estimating adults’ and children’s UVR exposure is critical to the design of effective interventions and the production of healthy UVR environments. Currently, there are limitations to the ways computer modeling and field measurements estimate individual UVR exposure in a given landscape. To address these limitations, this study developed an approach of integral calculation using six-directional (up, down, south, north, east, and west) field-measured UVR data and the estimated body exposure ratios (ER) for both children and adults. This approach showed high agreement when compared to a validated approach using ambient UVR and estimated ER data with a high r-square value (90.72% for child and adult models), and a low mean squared error (6.0% for child model and 5.1% for adult model) in an open area. This approach acting as a complementary tool between the climatology level and individual level can be used to estimate individual UVR exposure in a landscape with a complicated shady environment. In addition, measuring daily UVR data from six directions under open sky conditions confirmed that personal dosimeters underestimate actual individual UVR exposure.
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Affiliation(s)
- Wenwen Cheng
- College of Architecture, University of Oklahoma, Norman, OK 73019, USA
- Correspondence:
| | - Robert Brown
- Department of Landscape Architecture and Urban Planning, Texas A&M University, College Station, TX 77843, USA;
| | - David Vernez
- Center for Primary Care and Public Health (Unisanté), Department of Occupational and Environmental Health, University of Lausanne, CH-1015 Lausanne, Switzerland;
| | - Daniel Goldberg
- Department of Geography, Texas A&M University, College Station, TX 77843, USA;
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8
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Backes C, Religi A, Moccozet L, Behar-Cohen F, Vuilleumier L, Bulliard JL, Vernez D. Sun exposure to the eyes: predicted UV protection effectiveness of various sunglasses. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2019; 29:753-764. [PMID: 30382242 PMCID: PMC6803516 DOI: 10.1038/s41370-018-0087-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 09/24/2018] [Accepted: 09/26/2018] [Indexed: 06/08/2023]
Abstract
The aim of this study was to assess solar ultraviolet radiation (UVR) doses received by the eyes in different exposure situations, and to predict the sun protection effectiveness provided by various styles of sunglasses at facial, periorbital, and ocular skin zones including the cornea and accounting for different head positions. A 3D numeric model was optimized to predict direct, diffuse and reflected erythemally weighted UVR doses received at various skin zones. Precisely defined facial, periorbital, and ocular skin zones, sunglasses (goggles, medium-, and large-sized sunglasses) and three head positions were modeled to simulate daily (08:00-17:00) and midday (12:00-14:00) UVR doses. The shading from sunglasses' frame and lenses' UVR transmission were used to calculate a predictive protection factor (PPF [%]). Highest ocular daily UVR doses were estimated at the uncovered cornea (1718.4 J/m2). Least sun protection was provided by middle-sized sunglasses with highest midday dose at the white lateral (290.8 J/m2) and lateral periorbital zones (390.9 J/m2). Goggles reached almost 100% protection at all skin zones. Large-sized sunglasses were highly effective in winter; however, their effectiveness depended on diffuse UVR doses received. In "looking-up" head positions highest midday UVR doses were received at the unprotected cornea (908.1 J/m2), totally protected when large-sized sunglasses are used. All tested sunglass lenses fully blocked UVR. Sunglasses' protection effectiveness is strongly influenced by geometry, wearing position, head positions, and exposure conditions. Sunglasses do not totally block UVR and should be combined with additional protection means. 3D modeling allows estimating UVR exposure of highly sensitive small skin zones, chronically exposed and rarely assessed.
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Affiliation(s)
- C Backes
- Institute for Work and Health, University of Lausanne and Geneva, 1010, Lausanne, Switzerland.
- Division of Chronic Diseases, University Institute of Social and Preventive Medicine, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
| | - A Religi
- Centre Universitaire d'Informatique, University of Geneva, Geneva, Switzerland
| | - L Moccozet
- Centre Universitaire d'Informatique, University of Geneva, Geneva, Switzerland
| | - F Behar-Cohen
- INSERM U1138, Centre de Recherche des Cordeliers, Université Paris Descartes, Université Pierre et Marie Curie, Paris, France
| | - L Vuilleumier
- Federal Office of Meteorology and Climatology (MeteoSwiss), Payerne, Switzerland
| | - J L Bulliard
- Division of Chronic Diseases, University Institute of Social and Preventive Medicine, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - D Vernez
- Institute for Work and Health, University of Lausanne and Geneva, 1010, Lausanne, Switzerland
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9
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Corradi E, Baczynska KA, Morelii M, Giulietti D, Khazova M. Method for Measurements of Terrestrial Ultraviolet Radiation on Inclined Surfaces in Personal Dosimetry Field Studies. Photochem Photobiol 2019; 95:1454-1460. [PMID: 31172526 DOI: 10.1111/php.13131] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 05/25/2019] [Indexed: 12/25/2022]
Abstract
Understanding personal ultraviolet radiation (UVR) exposure is essential for the evaluation of the health risks and benefits; however, personal dosimetry could be challenging in large-scale or/and long-term population studies. Alternatively, personal exposure could be simulated using three-dimensional models and lifestyle surveys together with data on a body position with respect to the sun. These models require a real-time input on local environmental UVR. The main challenge in using this method is retrieval of the diffuse irradiance as it requires an often-expensive tracking of solar position. In this study, a hypothesis that UVR measured on a vertical plane in the north direction can be used in the UK as a proxy for diffuse radiation was tested against direct measurements and compared with models based on solar tracker data in Chilton, UK, (51.57°N) in June-July 2018. The statistical analysis over 17 days under all weather conditions showed that for 45° and 90° tilted surfaces the proposed method performed as well as the best of the models based on solar tracker data. A proposed system could offer a portable and low-cost alternative to measurements of diffuse radiation by solar tracking radiometers for spatial distribution of terrestrial erythema effective UVR in population field studies.
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Affiliation(s)
- Elena Corradi
- SiHealth, Didcot, UK.,Department of Physics, University of Pisa, Pisa, Italy
| | - Katarzyna A Baczynska
- Centre for Radiation, Chemical and Environmental Hazards, Public Health England, Chilton, Didcot, UK
| | | | | | - Marina Khazova
- Centre for Radiation, Chemical and Environmental Hazards, Public Health England, Chilton, Didcot, UK
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10
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Religi A, Backes C, Moccozet L, Vuilleumier L, Vernez D, Bulliard JL. Body Anatomical UV Protection Predicted by Shade Structures: A Modeling Study. Photochem Photobiol 2018; 94:1289-1296. [DOI: 10.1111/php.12949] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 05/25/2018] [Indexed: 11/30/2022]
Affiliation(s)
- Arianna Religi
- Centre Universitaire d'Informatique (CUI); University of Geneva; Geneva Switzerland
| | - Claudine Backes
- Institute for Work and Health; University of Lausanne and Geneva; Lausanne Switzerland
- Centre Hospitalier Universitaire Vaudois (CHUV); University Institute of Social and Preventive Medicine; University of Lausanne; Lausanne Switzerland
| | - Laurent Moccozet
- Centre Universitaire d'Informatique (CUI); University of Geneva; Geneva Switzerland
| | - Laurent Vuilleumier
- Federal Office of Meteorology and Climatology; MeteoSwiss; Payerne Switzerland
| | - David Vernez
- Institute for Work and Health; University of Lausanne and Geneva; Lausanne Switzerland
| | - Jean-Luc Bulliard
- Centre Hospitalier Universitaire Vaudois (CHUV); University Institute of Social and Preventive Medicine; University of Lausanne; Lausanne Switzerland
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11
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Schmalwieser AW, Siani AM. Review on Nonoccupational Personal Solar UV Exposure Measurements. Photochem Photobiol 2018; 94:900-915. [PMID: 29856894 DOI: 10.1111/php.12946] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 05/25/2018] [Indexed: 01/22/2023]
Abstract
Solar ultraviolet (UV) radiation follows people during their whole life. Exposure to UV radiation is vital but holds serious risks, too. The quantification of human UV exposure is a complex issue. UV exposure is directly related to incoming UV radiation as well as to a variety of factors such as the orientation of the exposed anatomical site with respect to the sun and the duration of exposure. The use of badge-sensors allows assessing the UV exposure of differently oriented body sites. Such UV devices have been available for over 40 years, and a variety of measuring campaigns have been undertaken since then. This study provides an overview of those studies which reported measurements of the personal UV exposure (PE) during outdoor activities of people not related to their occupation. This overview is given chronologically to show the progress of knowledge in this research and is given with respect to different activities. Special focus is put on the ratio of personal exposure to ambient UV radiation. This ratio, when given as a function of solar elevation, allows estimating PE at any other location or date if ambient UV radiation is known.
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Affiliation(s)
- Alois W Schmalwieser
- Unit of Physiology and Biophysics, University of Veterinary Medicine, Vienna, Austria
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12
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Backes C, Religi A, Moccozet L, Vuilleumier L, Vernez D, Bulliard JL. Facial exposure to ultraviolet radiation: Predicted sun protection effectiveness of various hat styles. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2018; 34:330-337. [PMID: 29682802 DOI: 10.1111/phpp.12388] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/17/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND/PURPOSE Solar ultraviolet radiation (UVR) doses received by individuals are highly influenced by behavioural and environmental factors. This study aimed at quantifying hats' sun protection effectiveness in various exposure conditions, by predicting UVR exposure doses and their anatomical distributions. METHODS A well-defined 3-dimensional head morphology and 4 hat styles (a cap, a helmet, a middle- and a wide-brimmed hat) were added to a previously published model. Midday (12:00-14:00) and daily (08:00-17:00) seasonal UVR doses were estimated at various facial skin zones, with and without hat wear, accounting for each UVR component. Protection effectiveness was calculated by the relative reduction in predicted UVR dose, expressed as a predictive protection factor (PPF). RESULTS The unprotected entire face received 2.5 times higher UVR doses during a summer midday compared to a winter midday (3.3 vs 1.3 standard erythema dose [SED]) with highest doses received at the nose (6.1 SED). During a cloudless summer day, the lowest mean UVR dose is received by the entire face protected by a wide-brimmed hat (1.7 SED). No hat reached 100% protection at any facial skin zone (PPFmax : 76%). Hats' sun protection effectiveness varied highly with environmental conditions and was mainly limited by the high contribution of diffuse UVR, irrespective of hat style. Larger brim sizes afforded greater facial protection than smaller brim sizes except around midday when the sun position is high. CONCLUSION Consideration of diffuse and reflected UVR in sun educational messages could improve sun protection effectiveness.
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Affiliation(s)
- Claudine Backes
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, Switzerland.,Centre Hospitalier Universitaire Vaudois, University Institute of Social and Preventive Medicine (IUMSP), University of Lausanne, Lausanne, Switzerland
| | - Arianna Religi
- Computer Science Centre, Information Science Institute, University of Geneva, Geneva, Switzerland
| | - Laurent Moccozet
- Computer Science Centre, Information Science Institute, University of Geneva, Geneva, Switzerland
| | - Laurent Vuilleumier
- Federal Office of Meteorology and Climatology (MeteoSwiss), Payerne, Switzerland
| | - David Vernez
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, Switzerland
| | - Jean-Luc Bulliard
- Centre Hospitalier Universitaire Vaudois, University Institute of Social and Preventive Medicine (IUMSP), University of Lausanne, Lausanne, Switzerland
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13
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Mobley CD, Diffey BL. The Solar Ultraviolet Environment at the Ocean. Photochem Photobiol 2018; 94:611-617. [DOI: 10.1111/php.12885] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 12/05/2017] [Indexed: 11/28/2022]
Affiliation(s)
| | - Brian L. Diffey
- Dermatological Sciences; Institute of Cellular Medicine; University of Newcastle; Newcastle upon Tyne UK
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14
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Yu J, Hua H, Liu Y, Liu Y. Distributions of Direct, Reflected, and Diffuse Irradiance for Ocular UV Exposure at Different Solar Elevation Angles. PLoS One 2016; 11:e0166729. [PMID: 27846278 PMCID: PMC5112793 DOI: 10.1371/journal.pone.0166729] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 11/02/2016] [Indexed: 11/18/2022] Open
Abstract
To analyze intensities of ocular exposure to direct (Eo,dir), reflected (Eo,refl), and diffuse (Eo,diff) ultraviolet (UV) irradiance at different solar elevation angles (SEAs), a rotating manikin and dual-detector spectrometer were used to monitor the intensity of ocular exposure to UV irradiation (Eo) and ambient UV radiation (UVR) under clear skies in Sanya, China. Eo,dir was derived as the difference between maximum and minimum measured Eo values. Eo,refl was converted from the value measured at a height of 160 cm. Eo,diff was calculated as the minimum measured Eo value minus Eo,refl. Regression curves were fitted to determine distributions of intensities and growth rates at different wavelengths and SEAs. Eo,dir differed from ambient UVR exposure. Linear, quadratic, and linear Eo,dir distributions were obtained in SEA ranges of 14°–30°, 30°–50°, and 50°–90°, respectively, with maximum Eo,dir at 32°–38° SEA. Growth rates of Eo,dir with increasing wavelength were fitted with quadratic functions in all SEA ranges. Distributions and growth rate of Eo,refl values were fitted with quadratic functions. Maximum Eo,diff was achieved at the same SEA for all fitted quadratic functions. Growth rate of Eo,diff with increasing wavelength was fitted with a linear function. Eo,dir distributions were fitted with linear or quadratic functions in different SEA ranges. All Eo,refl and Eo,diff distributions were fitted with quadratic functions. As SEA increased, the Eo,dir portion of Eo increased and then decreased; the Eo,refl portion increased from an initial minimum; and the Eo,diff portion first decreased and then increased. The findings may provide data supporting on construction of a mathematical model of ocular UV exposure.
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Affiliation(s)
- Jiaming Yu
- Ophthalmology Department, the Fourth Affiliated Hospital of China Medical University, Shenyang, Liaoning, China
| | - Hui Hua
- School of Public Health, China Medical University, Shenyang, Liaoning, China
| | - Yan Liu
- Department of Biomedical Engineering, China Medical University, Shenyang, China
| | - Yang Liu
- School of Public Health, China Medical University, Shenyang, Liaoning, China
- * E-mail:
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15
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Liu Y, Hu L, Wang F, Gao Y, Zheng Y, Wang Y, Liu Y. The angular distributions of ultraviolet spectral irradiance at different solar elevation angles under clear sky conditions. INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 2016; 60:63-72. [PMID: 25994798 DOI: 10.1007/s00484-015-1005-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 04/14/2015] [Accepted: 04/26/2015] [Indexed: 06/04/2023]
Abstract
To investigate the angular distributions of UVA, UVB, and effective UV for erythema and vitamin D (vitD) synthesis, the UV spectral irradiances were measured at ten inclined angles (from 0° to 90°) and seven azimuths (from 0° to 180°) at solar elevation angle (SEA) that ranged from 18.8° to 80° in Shanghai (31.22° N, 121.55° E) under clear sky and the albedo of ground was 0.1. The results demonstrated that in the mean azimuths and with the back to the sun, the UVA, UVB, and erythemally and vitD-weighted irradiances increased with the inclined angles and an increase in SEA. When facing toward the sun at 0°-60° inclined angles, the UVA first increased and then decreased with an increase in SEA; at other inclined angles, the UVA increased with SEA. At 0°-40° inclined angles, the UVB and erythemally and vitD-weighted irradiances first increased and then decreased with an increase in SEA, and their maximums were achieved at SEA 68.7°; at other inclined angles, the above three irradiances increased with an increase in SEA. The maximum UVA, UVB, and erythemally and vitD-weighted irradiances were achieved at an 80° inclined angle at SEA 80° (the highest in our measurements); the cumulative exposure of the half day achieved the maximum at a 60° inclined angle, but not on the horizontal. This study provides support for the assessment of human skin sun exposure.
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Affiliation(s)
- Yan Liu
- Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China
- Department of Biomedical Engineering, China Medical University, Shenyang, China
| | - LiWen Hu
- Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China
| | - Fang Wang
- Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China
| | - YanYan Gao
- Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China
| | - Yang Zheng
- Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China
| | - Yu Wang
- Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China
| | - Yang Liu
- Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China.
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Vernez D, Milon A, Vuilleumier L, Bulliard JL, Koechlin A, Boniol M, Doré JF. A general model to predict individual exposure to solar UV by using ambient irradiance data. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2015; 25:113-118. [PMID: 24496216 DOI: 10.1038/jes.2014.6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 11/11/2013] [Accepted: 12/15/2013] [Indexed: 06/03/2023]
Abstract
Excessive exposure to solar ultraviolet (UV) is the main cause of skin cancer. Specific prevention should be further developed to target overexposed or highly vulnerable populations. A better characterisation of anatomical UV exposure patterns is however needed for specific prevention. To develop a regression model for predicting the UV exposure ratio (ER, ratio between the anatomical dose and the corresponding ground level dose) for each body site without requiring individual measurements. A 3D numeric model (SimUVEx) was used to compute ER for various body sites and postures. A multiple fractional polynomial regression analysis was performed to identify predictors of ER. The regression model used simulation data and its performance was tested on an independent data set. Two input variables were sufficient to explain ER: the cosine of the maximal daily solar zenith angle and the fraction of the sky visible from the body site. The regression model was in good agreement with the simulated data ER (R(2)=0.988). Relative errors up to +20% and -10% were found in daily doses predictions, whereas an average relative error of only 2.4% (-0.03% to 5.4%) was found in yearly dose predictions. The regression model predicts accurately ER and UV doses on the basis of readily available data such as global UV erythemal irradiance measured at ground surface stations or inferred from satellite information. It renders the development of exposure data on a wide temporal and geographical scale possible and opens broad perspectives for epidemiological studies and skin cancer prevention.
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Affiliation(s)
- David Vernez
- Institute of Work and Health (IST), University of Lausanne and Geneva, Lausanne, Switzerland
| | - Antoine Milon
- Institute of Work and Health (IST), University of Lausanne and Geneva, Lausanne, Switzerland
| | - Laurent Vuilleumier
- Federal Office of Meteorology and Climatology, MeteoSwiss, Payerne, Switzerland
| | - Jean-Luc Bulliard
- Cancer Epidemiology Unit, University Institute of Social and Preventive Medicine (IUMSP), Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland
| | - Alice Koechlin
- International Prevention Research Institute (IPRI), Lyon, France
| | - Mathieu Boniol
- International Prevention Research Institute (IPRI), Lyon, France
| | - Jean F Doré
- Cancer Research Center of Lyon (CRCL), Lyon, France
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Milon A, Bulliard JL, Vuilleumier L, Danuser B, Vernez D. Estimating the contribution of occupational solar ultraviolet exposure to skin cancer. Br J Dermatol 2014; 170:157-64. [DOI: 10.1111/bjd.12604] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/21/2013] [Indexed: 11/30/2022]
Affiliation(s)
- A. Milon
- Institute of Work and Health (IST); University of Lausanne and Geneva; Route de la Corniche 2, 1066 Epalinges, Lausanne Switzerland
| | - J.-L. Bulliard
- Cancer Epidemiology Unit; University Institute of Social and Preventive Medicine (IUMSP); Centre Hospitalier Universitaire Vaudois and University of Lausanne; 10 route de la Corniche 1010 Lausanne Switzerland
| | - L. Vuilleumier
- Federal Office of Meteorology and Climatology (MeteoSwiss); chemin de l'Aérologie; 1530 Payerne Switzerland
| | - B. Danuser
- Institute of Work and Health (IST); University of Lausanne and Geneva; Route de la Corniche 2, 1066 Epalinges, Lausanne Switzerland
| | - D. Vernez
- Institute of Work and Health (IST); University of Lausanne and Geneva; Route de la Corniche 2, 1066 Epalinges, Lausanne Switzerland
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Feister U, Meyer G, Kirst U. Solar UV Exposure of Seafarers along Subtropical and Tropical Shipping Routes. Photochem Photobiol 2013; 89:1497-506. [DOI: 10.1111/php.12144] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 07/14/2013] [Indexed: 12/24/2022]
Affiliation(s)
- Uwe Feister
- German Meteorological Service; Meteorological Observatory Lindenberg - Richard-Aßmann-Observatory; Lindenberg Germany
| | - Gabriele Meyer
- German Social Accident Insurance Institution for Transport and Traffic; Hamburg Germany
| | - Ulrich Kirst
- German Social Accident Insurance Institution for Transport and Traffic; Hamburg Germany
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Seckmeyer G, Schrempf M, Wieczorek A, Riechelmann S, Graw K, Seckmeyer S, Zankl M. A novel method to calculate solar UV exposure relevant to vitamin D production in humans. Photochem Photobiol 2013; 89:974-83. [PMID: 23517086 DOI: 10.1111/php.12074] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 03/12/2013] [Indexed: 11/28/2022]
Abstract
We present a novel method to calculate vitamin D3 -weighted exposure by integrating the incident solar spectral radiance over all relevant parts of the human body. Earlier investigations are based on the irradiance on surfaces, whereas our calculated exposure of a voxel model of a human takes into account the complex geometry of the radiation field. Assuming that sufficient vitamin D3 (1000 international units) can be produced within the human body in one minute for a completely uncovered body in vertical posture in summer at midlatitudes (e.g. Rome, June 21, noon, UV index of 10), we calculate the exposure times needed in other situations or seasons to gain enough vitamin D3 . Our calculations show that the UV index is not a good indicator for the exposure which depends on the orientation of the body (e.g. vertical (standing) or horizontal (lying down) posture). Without clothing the exposure is dominated by diffuse sky radiation and it is nearly irrelevant how the body in vertical posture is oriented toward the sun. At the winter solstice (December 21, noon, cloudy) at least in central Europe sufficient vitamin D3 cannot be obtained with realistic clothing, even if the exposure were extended to all daylight hours.
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Affiliation(s)
- Gunther Seckmeyer
- Institute of Meteorology and Climatology, Leibniz University of Hannover, Hannover, Germany.
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Vernez D, Milon A, Vuilleumier L, Bulliard JL. Anatomical exposure patterns of skin to sunlight: relative contributions of direct, diffuse and reflected ultraviolet radiation. Br J Dermatol 2012; 167:383-90. [DOI: 10.1111/j.1365-2133.2012.10898.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Casale GR, Siani AM, Diémoz H, Kimlin MG, Colosimo A. Applicability of the polysulphone horizontal calibration to differently inclined dosimeters. Photochem Photobiol 2011; 88:207-14. [PMID: 21978150 DOI: 10.1111/j.1751-1097.2011.01006.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Polysulphone (PS) dosimetry has been a widely used technique for more than 30 years to quantify the erythemally effective UV dose received by anatomic sites (personal exposure). The calibration of PS dosimeters is an important issue as their spectral response is different from the erythemal action spectrum. It is performed exposing a set of PS dosimeters on a horizontal plane and measuring the UV doses received by dosimeters using calibrated spectroradiometers or radiometers. In this study, data collected during PS field campaigns (from 2004 to 2006), using horizontal and differently inclined dosimeters, were analyzed to provide some considerations on the transfer of the horizontal calibration to differently inclined dosimeters, as anatomic sites usually are. The role of sky conditions, of the angle of incidence between the sun and the normal to the slope, and of the type of surrounding surface on the calibration were investigated. It was concluded that PS horizontal calibrations apply to differently inclined dosimeters for incidence angles up to approximately 70° and for surfaces excluding ones with high albedo. Caution should be used in the application of horizontal calibrations for cases of high-incidence angle and/or high albedo surfaces.
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