Influencing Factors of the Carbon Adsorption Properties of Radon
In order to prevent the indoor radon from being harmful to human health, it is necessary to accurately measure the indoor air radon concentration. Among them, the activated carbon box is one of the commonly used methods, but its accurate measurement is affected by many factors. To facilitate the acc...
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| Format: | Article |
| Language: | zho |
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Editorial Board of Journal of Isotopes
2018-02-01
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| Series: | Journal of Isotopes |
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| Online Access: | http://www.tws.org.cn/CN/abstract/abstract1798.shtml |
| _version_ | 1818426767775367168 |
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| author | ZHANG Yanli1,2;TANG Xuan1,2;CAO Zhongsheng1,2;TIAN Shihong3;LI Wenzhong1,2 |
| author_facet | ZHANG Yanli1,2;TANG Xuan1,2;CAO Zhongsheng1,2;TIAN Shihong3;LI Wenzhong1,2 |
| author_sort | ZHANG Yanli1,2;TANG Xuan1,2;CAO Zhongsheng1,2;TIAN Shihong3;LI Wenzhong1,2 |
| collection | DOAJ |
| description | In order to prevent the indoor radon from being harmful to human health, it is necessary to accurately measure the indoor air radon concentration. Among them, the activated carbon box is one of the commonly used methods, but its accurate measurement is affected by many factors. To facilitate the accurate measurement of indoor air radon concentration, the passive activated carbon box method was used, and the γ-ray spectrum total counts of activated carbon samples with different conditions were measured by using a low background NaI(Tl) scintillation detector with lead chamber. The effects of adsorption time, dryness, dosage and position of the activated carbon on the radon adsorption capacity of activated carbon were investigated. The experimental results showed that the adsorption time was not as long as possible, the adsorption time was chosen for 3 days or 4 days for the best. The adsorbing capacity of radon was strong for the dry activated carbon, so in the first 3 days, the adsorbing capacity of radon was greater for the drying carbon than that for not-drying, and then with the adsorption time increasing, the water content for the dry activated carbon increased, and finally a phenomenon occurred that the two were equal. In the first 3 days, the penetration depth for radon in the activated carbon was less than the filling depth for the activated carbon, so the adsorption of radon was equal for the three different amounts of the activated carbon. With the adsorption time increasing, the penetration depth continued to increase, and finally the greater the amount of the activated carbon, and the greater the adsorption capacity of radon. In the closed and the radon concentration uneven indoor, the position of the activated carbon had no effect on the adsorption capacity of radon. Therefore, if using the activated carbon box method to measure the indoor air radon concentration, the dry, amount of activated carbon, and 3 days or 4 days for adsorption time should be used, and the position of the activated carbon in the indoor ground position was not to be considered. |
| first_indexed | 2024-12-14T14:35:04Z |
| format | Article |
| id | doaj.art-865beb28695c4f6392b14d4e3c997706 |
| institution | Directory Open Access Journal |
| issn | 1000-7512 1000-7512 |
| language | zho |
| last_indexed | 2024-12-14T14:35:04Z |
| publishDate | 2018-02-01 |
| publisher | Editorial Board of Journal of Isotopes |
| record_format | Article |
| series | Journal of Isotopes |
| spelling | doaj.art-865beb28695c4f6392b14d4e3c9977062022-12-21T22:57:41ZzhoEditorial Board of Journal of IsotopesJournal of Isotopes1000-75121000-75122018-02-013129910310.7538/tws.2017.youxian.046Influencing Factors of the Carbon Adsorption Properties of RadonZHANG Yanli1,2;TANG Xuan1,2;CAO Zhongsheng1,2;TIAN Shihong3;LI Wenzhong1,201.Engineering and Technical College of Chengdu University of Technology, Leshan 614000, China;2.Southwestern Institute of Physics, Chengdu 610041, China;3.Kunming University of Science and Technology, Kunming 650500, ChinaIn order to prevent the indoor radon from being harmful to human health, it is necessary to accurately measure the indoor air radon concentration. Among them, the activated carbon box is one of the commonly used methods, but its accurate measurement is affected by many factors. To facilitate the accurate measurement of indoor air radon concentration, the passive activated carbon box method was used, and the γ-ray spectrum total counts of activated carbon samples with different conditions were measured by using a low background NaI(Tl) scintillation detector with lead chamber. The effects of adsorption time, dryness, dosage and position of the activated carbon on the radon adsorption capacity of activated carbon were investigated. The experimental results showed that the adsorption time was not as long as possible, the adsorption time was chosen for 3 days or 4 days for the best. The adsorbing capacity of radon was strong for the dry activated carbon, so in the first 3 days, the adsorbing capacity of radon was greater for the drying carbon than that for not-drying, and then with the adsorption time increasing, the water content for the dry activated carbon increased, and finally a phenomenon occurred that the two were equal. In the first 3 days, the penetration depth for radon in the activated carbon was less than the filling depth for the activated carbon, so the adsorption of radon was equal for the three different amounts of the activated carbon. With the adsorption time increasing, the penetration depth continued to increase, and finally the greater the amount of the activated carbon, and the greater the adsorption capacity of radon. In the closed and the radon concentration uneven indoor, the position of the activated carbon had no effect on the adsorption capacity of radon. Therefore, if using the activated carbon box method to measure the indoor air radon concentration, the dry, amount of activated carbon, and 3 days or 4 days for adsorption time should be used, and the position of the activated carbon in the indoor ground position was not to be considered.http://www.tws.org.cn/CN/abstract/abstract1798.shtmlactivated carbon radon passive adsorption adsorption capacity |
| spellingShingle | ZHANG Yanli1,2;TANG Xuan1,2;CAO Zhongsheng1,2;TIAN Shihong3;LI Wenzhong1,2 Influencing Factors of the Carbon Adsorption Properties of Radon Journal of Isotopes activated carbon radon passive adsorption adsorption capacity |
| title | Influencing Factors of the Carbon Adsorption Properties of Radon |
| title_full | Influencing Factors of the Carbon Adsorption Properties of Radon |
| title_fullStr | Influencing Factors of the Carbon Adsorption Properties of Radon |
| title_full_unstemmed | Influencing Factors of the Carbon Adsorption Properties of Radon |
| title_short | Influencing Factors of the Carbon Adsorption Properties of Radon |
| title_sort | influencing factors of the carbon adsorption properties of radon |
| topic | activated carbon radon passive adsorption adsorption capacity |
| url | http://www.tws.org.cn/CN/abstract/abstract1798.shtml |
| work_keys_str_mv | AT zhangyanli12tangxuan12caozhongsheng12tianshihong3liwenzhong12 influencingfactorsofthecarbonadsorptionpropertiesofradon |