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Lapointe MR, Laframboise T, Pirkkanen J, Tai TC, Lees SJ, Santa Maria SR, Tharmalingam S, Boreham DR, Thome C. Protracted Exposure to a Sub-background Radiation Environment Negatively Impacts the Anhydrobiotic Recovery of Desiccated Yeast Sentinels. HEALTH PHYSICS 2024; 126:397-404. [PMID: 38568172 DOI: 10.1097/hp.0000000000001804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
ABSTRACT Experiments that examine the impacts of subnatural background radiation exposure provide a unique approach to studying the biological effects of low-dose radiation. These experiments often need to be conducted in deep underground laboratories in order to filter surface-level cosmic radiation. This presents some logistical challenges in experimental design and necessitates a model organism with minimal maintenance. As such, desiccated yeast ( Saccharomyces cerevisiae ) is an ideal model system for these investigations. This study aimed to determine the impact of prolonged sub-background radiation exposure in anhydrobiotic (desiccated) yeast at SNOLAB in Sudbury, Ontario, Canada. Two yeast strains were used: a normal wild type and an isogenic recombinational repair-deficient rad51 knockout strain ( rad51 Δ). Desiccated yeast samples were stored in the normal background surface control laboratory (68.0 nGy h -1 ) and in the sub-background environment within SNOLAB (10.1 nGy h -1 ) for up to 48 wk. Post-rehydration survival, growth rate, and metabolic activity were assessed at multiple time points. Survival in the sub-background environment was significantly reduced by a factor of 1.39 and 2.67 in the wild type and rad51 ∆ strains, respectively. Post-rehydration metabolic activity measured via alamarBlue reduction remained unchanged in the wild type strain but was 26% lower in the sub-background rad51 ∆ strain. These results demonstrate that removing natural background radiation negatively impacts the survival and metabolism of desiccated yeast, highlighting the potential importance of natural radiation exposure in maintaining homeostasis of living organisms.
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Affiliation(s)
| | | | | | | | - Simon J Lees
- Medical Sciences Division, NOSM University, Sudbury, Ontario, Canada
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Pradana R, Nugraha ED, Wahyudi W, Untara U, Wiyono M, Devriany A, Shilfa SN, Sasaki M, Prasetio H, Winarni ID, Ekaranti E, Nuraeni N, Kranrod C, Iskandar D, Suhariyono G, Surniyantoro HNE, Makhsun M, Widodo S, Omori Y, Hiswara E, Hosoda M, Yoshinaga S, Tokonami S. Car-borne survey and dose assessment from external radiation exposure in Bangka Island. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:89280-89292. [PMID: 37452241 DOI: 10.1007/s11356-023-28640-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 07/02/2023] [Indexed: 07/18/2023]
Abstract
With a history of more than 200 years of tin mining, Bangka Island has brought along a byproduct of heavy minerals containing radionuclide elements. There are some concerns about this byproduct material contributing to natural radiation in the environment. In this study, a car-borne survey was conducted to accurately assess natural background radiation in Bangka Island. Indoor and outdoor ambient dose rates in 146 houses were also measured to assess the radiation dose from external exposure received by the public. Soil samples were collected and measured using a gamma spectroscopy system to evaluate the contributions of specific radionuclides to external terrestrial exposure. From 3790 measurement points during the car-borne survey, the highest ambient dose equivalent rate was 596 nSv h-1 measured in Muntok area, with a mean value of 101 nSv h-1 and a median value of 95 nSv h-1. The ambient dose equivalent rate distribution map showed a relatively higher value in the northern coastal area of the island, where the Pemali tin deposit is located. The annual effective dose received from external radiation in the 146 houses in Bangka Island ranged from 0.44 to 1.30 mSv year-1, with a median value of 0.66 mSv year-1. The soil contained a relatively high amount of thorium (232Th), which contributed 69% to external radiation exposure in Bangka Island.
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Affiliation(s)
- Radhia Pradana
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
- Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, 036-8564, Japan
| | - Eka Djatnika Nugraha
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia.
| | - Wahyudi Wahyudi
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Untara Untara
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Muji Wiyono
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Ade Devriany
- Health Ministry Polytechnic of Pangkal Pinang, Bangka Tengah, 33148, Bangka Belitung, Indonesia
| | - Sharah Nataz Shilfa
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Michiya Sasaki
- Biology and Environmental Chemistry Division, Sustainable System Research Laboratory, Central Research Institute of Electric Power Industry, Chiba, 270-1194, Japan
| | - Heru Prasetio
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Ilma Dwi Winarni
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Egnes Ekaranti
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Nunung Nuraeni
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Chutima Kranrod
- Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Aomori, 036-8564, Japan
| | - Dadong Iskandar
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Gatot Suhariyono
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Harry Nugroho Eko Surniyantoro
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Makhsun Makhsun
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Susilo Widodo
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Yasutaka Omori
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
- Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Aomori, 036-8564, Japan
| | - Eri Hiswara
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
| | - Masahiro Hosoda
- Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, 036-8564, Japan
- Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Aomori, 036-8564, Japan
| | - Shinji Yoshinaga
- Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3, Kasumi, Minami-Ku, Hiroshima, 734-8553, Japan
| | - Shinji Tokonami
- Research Center for Safety, Metrology, and Nuclear Technology, The National Research and Innovation Agency of Indonesia (BRIN), Tangerang Selatan, 15314, Banten, Indonesia
- Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Aomori, 036-8564, Japan
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