Kardan Mohammad Reza, Sadeghi Nahid, Fathabadi Nasrin, Attarilar Ali
Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.
Iran Nuclear Regulatory Authority, Tehran, Iran.
Radiat Prot Dosimetry. 2019 Aug 1;184(2):189-197. doi: 10.1093/rpd/ncy198.
Estimation of terrestrial external radiation is essential for assessment of public exposure to natural radiation. During national survey of natural radionuclide in soil in Iran, 979 soil samples were collected from different locations, in the same time ambient dose equivalent rate was measured by a scintillator detector. In this work, terrestrial radiation was estimated by direct measurement of ambient dose equivalent rate of background radiation. The response of dose measuring instrument to cosmic radiation at ground level was measured and other components were discussed and estimated. For verification, terrestrial radiation derived from this method was compared with those calculated from activity concentration of natural radionuclides in soil. The averages of ambient dose equivalent rate derived from activity concentration of by natural radionuclide in soil and from direct measurement are 55.07 and 62.57 nSv/h, respectively. The source of statistical and systematic uncertainties are introduced and discussed.
估算陆地外部辐射对于评估公众受到的天然辐射照射至关重要。在伊朗全国土壤天然放射性核素调查期间，从不同地点采集了979份土壤样本，同时用闪烁探测器测量了环境剂量当量率。在这项工作中，通过直接测量背景辐射的环境剂量当量率来估算陆地辐射。测量了剂量测量仪器对地面宇宙辐射的响应，并对其他成分进行了讨论和估算。为进行验证，将该方法得出的陆地辐射与根据土壤中天然放射性核素活度浓度计算得出的陆地辐射进行了比较。由土壤中天然放射性核素活度浓度得出的环境剂量当量率平均值和直接测量得出的环境剂量当量率平均值分别为55.07和62.57纳 Sv/h。介绍并讨论了统计和系统不确定性的来源。
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