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Jabbade M, Nachab A, Elouardi E, Nourreddine AM, Errami E, Benjelloun M, Fahad M. Study of the effect of temperature and water content on radon exhalation from phosphate using LR-115 detectors. RADIATION PROTECTION DOSIMETRY 2023; 199:2212-2217. [PMID: 37934986 DOI: 10.1093/rpd/ncad172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 02/13/2023] [Accepted: 05/18/2023] [Indexed: 11/09/2023]
Abstract
A study of the influence of moisture content on the radon exhalation rate from phosphate samples (with and without consideration of the back diffusion effect) was performed using the sealed cup technique. The mass exhalation rate was found to increase with an increase in moisture content, reaching a maximum value of 2.414 ± 0.034 Bq kg-1 h-1 with a moisture content of 10%. However, the mass exhalation rate decreased with a continued increase in moisture content above 25%. The mass exhalation rate was also measured at different temperatures between -10 and 50°C. The obtained results show that the mass exhalation rate increases linearly with temperature. We point out that all the obtained values of radon exhalation rate are lower than the world average radon exhalation rate (57.6 Bq m-2 h-1).
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Affiliation(s)
- Meryame Jabbade
- Laboratory of Nuclear, Atomic, Molecular, Mechanical and Energetic Physics, Faculty of Sciences, Chouaib Doukkali University, El Jadida, Morocco
| | - Abdellatif Nachab
- Laboratory of Fundamental and Applied Physics, Polydisciplinary Faculty of Safi, Cadi Ayyad University, Safi, Morocco
| | - Elmokhtar Elouardi
- Laboratory of Fundamental and Applied Physics, Polydisciplinary Faculty of Safi, Cadi Ayyad University, Safi, Morocco
| | | | - Ezzoura Errami
- Polydisciplinary Faculty of Safi, Cadi Ayyad University, Safi, Morocco
| | - Mohammed Benjelloun
- Laboratory of Nuclear, Atomic, Molecular, Mechanical and Energetic Physics, Faculty of Sciences, Chouaib Doukkali University, El Jadida, Morocco
| | - Mohammed Fahad
- Laboratory of Nuclear, Atomic, Molecular, Mechanical and Energetic Physics, Faculty of Sciences, Chouaib Doukkali University, El Jadida, Morocco
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Kuzmanović P, Miljević B, Todorović N, Forkapić S, Čeliković I, Petrović LF, Radić JK. The influence of building material structure on radon emanation. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2022; 42:041508. [PMID: 36541479 DOI: 10.1088/1361-6498/aca59d] [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: 10/07/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
In this work, the radon emanation coefficients for selected building materials that are most often used in Serbia for covering floor surfaces (concrete, concrete screed, granite, glazed ceramic tiles, marble, roofing tile, and terrazzo tile) were determined, and the influence of the material structure on their values. The concentration of226Ra activity in the samples was determined using the gamma spectrometry method. Radon emanation was measured with the RAD7 device. The porosity of the samples was tested using mercury intrusion porosimetry and water absorption methods, and the structural analysis was performed using x-ray diffraction analysis and x-ray fluorescence analysis. The measured values of226Ra activity concentrations were in the range (4.93-298) Bq kg-1, and the estimated values of the radon emanation coefficients were in the range (0.55-6.05) %. The obtained results indicate that the chemical and mineralogical composition, method of production, and the226Ra activity concentration have an influence on the emanation of radon from the material. No significant correlation was found between the radon emanation coefficient and the open porosity of the material, most likely due to the inhomogeneous presence of pores of different dimensions in the materials. It was established that the total value of the emanation coefficient depends on the emanation coefficient for pores ⩽100μm in size.
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Affiliation(s)
- Predrag Kuzmanović
- Faculty of Sciences, Department of Physics, University of Novi Sad, Trg Dositeja Obradovica 4, Novi Sad, 21000, Serbia
- Academy of Applied Studies Šabac, Department of Medical and Business-Technological Studies, Laboratory for Physics, Hajduk Veljkova 10, 15000 Šabac, Serbia
| | - Bojan Miljević
- Faculty of Technology, Department of Materials Engineering, University of Novi Sad, Bulevar cara Lazara 1, 21000 Novi Sad, Serbia
| | - Nataša Todorović
- Faculty of Sciences, Department of Physics, University of Novi Sad, Trg Dositeja Obradovica 4, Novi Sad, 21000, Serbia
| | - Sofija Forkapić
- Faculty of Sciences, Department of Physics, University of Novi Sad, Trg Dositeja Obradovica 4, Novi Sad, 21000, Serbia
| | - Igor Čeliković
- University of Belgrade, 'Vinča' Institute of Nuclear Sciences, National Institute of the Republic of Serbia, PO Box 522, Belgrade, 11000, Serbia
| | - Leposava Filipović Petrović
- Academy of Applied Studies Šabac, Department of Medical and Business-Technological Studies, Laboratory for Physics, Hajduk Veljkova 10, 15000 Šabac, Serbia
| | - Jovana Knežević Radić
- Faculty of Sciences, Department of Physics, University of Novi Sad, Trg Dositeja Obradovica 4, Novi Sad, 21000, Serbia
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Study of Surface Emissions of 220Rn (Thoron) at Two Sites in the Campi Flegrei Caldera (Italy) during Volcanic Unrest in the Period 2011–2017. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11135809] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The study concerns the analysis of 220Rn (thoron) recorded in the surface soil in two sites of the Campi Flegrei caldera (Naples, Southern Italy) characterized by phases of volcanic unrest in the seven-year period 1 July 2011–31 December 2017. Thoron comes only from the most surface layer, so the characteristics of its time series are strictly connected to the shallow phenomena, which can also act at a distance from the measuring point in these particular areas. Since we measured 220Rn in parallel with 222Rn (radon), we found that by using the same analysis applied to radon, we obtained interesting information. While knowing the limits of this radioisotope well, we highlight only the particular characteristics of the emissions of thoron in the surface soil. Here, we show that it also shows some clear features found in the radon signal, such as anomalies and signal trends. Consequently, we provide good evidence that, in spite of the very short life of 220Rn compared to 222Rn, both are related to the carrier effect of CO2, which has significantly increased in the last few years within the caldera. The hydrothermal alterations, induced by the increase in temperature and pressure of the caldera system, occur in the surface soils and significantly influence thoron’s power of exhalation from the surface layer. The effects on the surface thoron are reflected in both sites, but with less intensity, the same behavior of 222Rn following the increasing movements and fluctuations of the geophysical and geochemical parameters (CO2 flux, fumarolic tremor, background seismicity, soil deformation). An overall linear correlation was found between the 222−220Rn signals, indicating the effect of the CO2 vector. The overall results represent a significant step forward in the use and interpretation of the thoron signal.
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Abdalla AM, Al-Naggar TI, Bashiri AM. Radon gas build up using alpha scintillation cell: Experimentally and theoretically. Appl Radiat Isot 2021; 175:109796. [PMID: 34102412 DOI: 10.1016/j.apradiso.2021.109796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/06/2021] [Accepted: 05/26/2021] [Indexed: 10/21/2022]
Abstract
Due to their high efficiency and speed of use, alpha scintillation cell is being increasingly utilized for detection of radon (222Rn) in soil gas. The calibration factor of the 110 A active radon cell has been addressed and thoroughly discussed. The sensitivity and the efficiency have been determined. It is found that the sensitivity and the registration efficiency of this scintillation cell (110 A active cell) are equal to 0.015895 cpm/Bq/m3, 59%. Respectively. A nuclear system was adapted to measure the accumulation of radon gas using the active scintillation cell. The growth curves of radon activity have been investigated. Radon emanation, leakage and back diffusion rates from natural occurring radioactive materials has been determined. Compatibility between practical measurements and results based on the theoretical equation were achieved.
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Affiliation(s)
- Ayman M Abdalla
- Department of Physics, Faculty of Arts and Sciences, Najran University, Najran, Saudi Arabia; Unit of Radiation Protection, Najran University, Najran 1101, Saudi Arabia.
| | - Tayseer I Al-Naggar
- Department of Physics, Faculty of Arts and Sciences, Najran University, Najran, Saudi Arabia; Unit of Radiation Protection, Najran University, Najran 1101, Saudi Arabia; Department of Physics, College of Women, for Art, Science and Education, Ain Shams University, Cairo, Egypt
| | - Aishah M Bashiri
- Department of Physics, Faculty of Arts and Sciences, Najran University, Najran, Saudi Arabia; Unit of Radiation Protection, Najran University, Najran 1101, Saudi Arabia
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Study on radon (222Rn) emanation coefficient and mass exhalation rate from heavy minerals of high specific gravity. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07648-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Sukanya S, Noble J, Joseph S. Factors controlling the distribution of radon ( 222Rn) in groundwater of a tropical mountainous river basin in southwest India. CHEMOSPHERE 2021; 263:128096. [PMID: 33297092 DOI: 10.1016/j.chemosphere.2020.128096] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 08/19/2020] [Accepted: 08/21/2020] [Indexed: 06/12/2023]
Abstract
Studies on occurrence of radon in the environment are receiving growing attention worldwide due to its adverse impact on human health. Despite that, the dissolved radon in water is found to be a useful tracer in many hydrogeological studies. Although, several studies focused on the occurrence of high 222Rn in groundwater, the processes responsible for its variation is still not well understood. Hence, an attempt has been made in the present study to elucidate the underlying factors influencing the abundance 222Rn in hard rock (gneissic) aquifers of Karamana River Basin, southwest India. 222Rn in groundwater was analyzed in 71 dug wells during the pre-monsoon period of 2017. A large variability in 222Rn activities (170-68,350 Bq/m3) was noticed in groundwater and high activities were mainly seen in the khondalite formation. No significant dependencies between 222Rn activity and depth to water table, groundwater temperature and electrical conductivity were observed. However, majority of the presence of high 222Rn activity in groundwater matches with the location of lineaments. Furthermore, radium content in the host rock, degree of weathering and fracturing and the emanation coefficient of the rock were found to have an important bearing on the occurrence of radon in groundwater. The underlying factors influencing the abundance of radon in hard rock aquifers were also conceptualized. Thus, the study highlights the usefulness of 222Rn as a potential tool in delineating the macro-structural features like fractures/lineaments that are significant repositories of groundwater, which could be explored for groundwater development in hard rock terrains.
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Affiliation(s)
- S Sukanya
- Department of Environmental Sciences, University of Kerala, Thiruvananthapuram, 695581, India
| | - Jacob Noble
- Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India.
| | - Sabu Joseph
- Department of Environmental Sciences, University of Kerala, Thiruvananthapuram, 695581, India
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