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首页> 外文期刊>Journal of Environmental Radioactivity >Long-term measurements of residential radon, thoron, and thoron progeny concentrations around the Chhatrapur placer deposit, a high background radiation area in Odisha, India
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Long-term measurements of residential radon, thoron, and thoron progeny concentrations around the Chhatrapur placer deposit, a high background radiation area in Odisha, India

机译：长期测量印度奥里萨邦高背景辐射区查特拉普尔砂矿床附近居民concentrations，和tho子代的浓度

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摘要

The Chhatrapur placer deposit is found in a high background radiation area which has been recently identified on the southeastern coast of India. Previously, some geochemical studies of this area were carried out to assess external dose from radionuclides-bearing heavy mineral sands. In this study, radon, thoron and thoron progeny concentrations were measured in about 100 dwellings during three seasons (autumn-winter, summer, and rainy) in a 10- to 12-month period and annual doses due to inhalation of them were evaluated. The measurements were made by passive-type radon-thoron discriminative detectors and thoron progeny detectors in which solid state nuclear track detectors were deployed. The results show that radon and thoron concentrations differ by one order of magnitude depending on exposure periods, while thoron progeny concentration is nearly constant throughout the year. Since thorium-rich sand is distributed in the studied area, exposure to thoron is equal to, or exceeds, exposure to radon and is not negligible for dose evaluation. Based on the measurements, doses due to inhalation of radon and thoron are evaluated as 0.1-1.6 mSv y(-1) and 0.2-3.8 mSv y(-1), respectively. The total dose is 0.8-4.6 mSv y(-1), which is the same order of magnitude as the worldwide value. (C) 2016 Elsevier Ltd. All rights reserved.
机译：Chhatrapur砂矿沉积物位于高背景辐射区，最近在印度东南沿海被发现。以前，对该地区进行了一些地球化学研究，以评估含放射性核素的重矿物砂的外部剂量。在这项研究中，在10到12个月的三个季节（秋季，冬季，夏季和雨季）的约100户住所中测量了,、和的子代浓度，并评估了因吸入而产生的年剂量。测量是通过被动型ra-tho判别探测器和气后裔探测器（其中部署了固态核径迹探测器）进行的。结果表明，exposure和and的浓度根据暴露时间的不同而相差一个数量级，而的子代浓度在全年中几乎保持恒定。由于富th的沙子分布在研究区域中，因此，ron的暴露量等于或超过ra的暴露量，因此剂量评估不可忽略。基于这些测量，由于to和的吸入所致的剂量分别评估为0.1-1.6 mSv y（-1）和0.2-3.8 mSv y（-1）。总剂量为0.8-4.6 mSv y（-1），与世界范围的值相同。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Environmental Radioactivity》 |2016年第10期|371-378|共8页
  • 作者

    Omori Yasutaka; Prasad Ganesh; Sorimachi Atsuyuki; Sahoo Sarata Kumar; Ishikawa Tetsuo; Sagar Devulapalli Vidya; Ramola Rakesh Chand; Tokonami Shinji;

  • 作者单位

    Natl Inst Radiol Sci, Res Ctr Radiat Protect, Inage Ku, 4-9-1 Anagawa, Chiba 2638555, Japan|Fukushima Med Univ, Dept Radiat Phys & Chem, 1 Hikarigaoka, Fukushima 9601295, Japan;

    HNB Garhwal Univ, Dept Phys, Badshahi Thaul Campus, Tehri Garhwal 249199, India;

    Hirosaki Univ, Inst Radiat Emergency Med, 66-1 Hon Cho, Hirosaki, Aomori 0368564, Japan|Fukushima Med Univ, Dept Radiat Phys & Chem, 1 Hikarigaoka, Fukushima 9601295, Japan;

    Natl Inst Radiol Sci, Res Ctr Radiat Protect, Inage Ku, 4-9-1 Anagawa, Chiba 2638555, Japan;

    Natl Inst Radiol Sci, Res Ctr Radiat Protect, Inage Ku, 4-9-1 Anagawa, Chiba 2638555, Japan|Fukushima Med Univ, Dept Radiat Phys & Chem, 1 Hikarigaoka, Fukushima 9601295, Japan;

    Indian Rare Earths Ltd, Hlth Phys Unit, BARC, EAD, Bombay 761045, Odisha, India;

    HNB Garhwal Univ, Dept Phys, Badshahi Thaul Campus, Tehri Garhwal 249199, India;

    Hirosaki Univ, Inst Radiat Emergency Med, 66-1 Hon Cho, Hirosaki, Aomori 0368564, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ambient gamma dose rate; External dose; High background radiation area; Internal dose; Radon; Thoron;

    机译：环境伽玛剂量率;外部剂量;高背景辐射区域;内部剂量;Ra;索伦;

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