印度科皮里断裂带和志龙高原片麻岩复合体地质样本中 222Rn 呼出率、有效 226Ra 含量和辐射风险的测量结果

IF 1.4 3区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR
Pranjal Protim Gogoi, Sarat Phukan, Debajyoti Barooah
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引用次数: 0

摘要

本报告揭示了在印度地震活跃的科皮利断层带附近和远处采集的岩石和土壤的 222Rn 呼出率、有效 226Ra 含量和年有效剂量的测量结果。LR-115 (II) 核轨道探测器被用于调查志龙高原地震活跃断层带和片麻岩综合体的辐照情况,这些地方具有显著的地质特征,经常发生地震。在这项研究中,计算出在断层附近和远处采集的花岗岩、片麻岩和土壤样本的 222Rn 质量呼出率范围分别为 73.2-83.0、11.0-14.8、21.1-70.7 和 34.3-65.5、6.4-9.9、19.1-28.9 mBq kg-1 h-1。在断层附近和远处采集的花岗岩、片麻岩和土壤样品的 222Rn 地表呼出率分别为 2428.8-2751.7、365.6-491.9、698.3-2345.9 和 1138.6-2172.7、211.9-328.2、634.9-960.0 mBq m-2 h-1 之间。在类似分布区采集的花岗岩、片麻岩和土壤中的 226Ra 含量分别为 9.76-11.06, 1.47-1.98, 2.8-9.4 和 4.58-8.74, 0.85-1.32, 2.6-3.6 Bq kg-1。根据计算,花岗岩、片麻岩和土壤每年因吸入 222Rn 而产生的有效剂量分别为 176.3-199.8、26.5-35.7、50.7-170.3 和 82.7-157.7、15.4-23.8、46.1-69.7 μSv y-1。本研究还分析了终生死亡风险。在断层附近采集的样本比在较远处采集的样本显示出更高的数值。不过,结果表明,测量值都在全球公认的允许范围之内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measurements of 222Rn exhalation rates, effective 226Ra contents, and radiological risks from geological samples of Kopili Fault Zone and gneissic complex of Shillong Plateau, India
This report unveils the outcomes of measurements of 222Rn exhalation rates, effective 226Ra content, and the annual effective dose for rocks and soil collected in the vicinity and far from the seismically active Kopili Fault Zone, India. LR-115 (II) nuclear track detector has been used to investigate radiation exposure in the seismically active fault zone and gneissic complex of the Shillong Plateau, which have significant geological characteristics and frequently produce earthquakes. In this study, 222Rn mass exhalation rates for granite, gneiss, and soil samples collected near and far from the fault were calculated to be in the ranges of 73.2–83.0, 11.0–14.8, 21.1–70.7 and 34.3–65.5, 6.4–9.9, 19.1–28.9 mBq kg−1 h−1, respectively. Surface exhalation rates of 222Rn for granite, gneiss, and soil samples collected near and far from the fault varied between 2428.8–2751.7, 365.6–491.9, 698.3–2345.9, and 1138.6–2172.7, 211.9–328.2, 634.9–960.0 mBq m−2 h−1, respectively. The 226Ra contents of granite, gneiss, and soil collected in similar distributions were found to vary from 9.76–11.06, 1.47–1.98, 2.8–9.4, and 4.58–8.74, 0.85–1.32, 2.6–3.6 Bq kg−1, respectively. The annual effective doses attributed to 222Rn inhalation from exposure to the samples were calculated to be in the ranges of 176.3–199.8, 26.5–35.7, 50.7–170.3 and 82.7–157.7, 15.4–23.8, 46.1–69.7 μSv y−1, respectively, for granite, gneiss, and soil. The lifetime fatality-risks have also been analysed in this study. The samples that were collected in close proximity to the fault showed higher values than those that were collected farther away. However, the results reveal that the measured values are within the globally recognised permissible range.
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来源期刊
Radiochimica Acta
Radiochimica Acta 化学-核科学技术
CiteScore
2.90
自引率
16.70%
发文量
78
审稿时长
6 months
期刊介绍: Radiochimica Acta publishes manuscripts encompassing chemical aspects of nuclear science and technology.
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