A Comparative Study of Field Gamma-ray Spectrometry by NaI(Tl) and HPGe Detectors in the South Caspian Region
A Comparative Study of Field Gamma-ray Spectrometry by NaI(Tl) and HPGe Detectors in the South Caspian Region
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南里海地区 NaI(Tl) 和 HPGe 探测器现场伽马射线能谱测量的比较研究
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发表时间：
2010
期刊：
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通讯作者：
A. Moghaddasi
中科院分区：
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作者：
A. Sadremomtaz;M. V. Moghaddam;S. Khoshbinfar;A. Moghaddasi
土壤中存在的天然放射性核素以及释放到环境中的某些人为放射性核素是陆地户外照射的主要来源。在评估环境放射性对人体的照射量时，除了土壤和植被采样结合环境介质实验室分析的传统方法外，另一种选择是现场光谱法，这是一种快速、有效和经济的鉴定环境中放射性核素的方法。新开发的高分辨率固态伽马射线探测器提供了用于这种目的的现有技术手段。然而，它们相对昂贵，可能不能提供可能的最高固有效率，并且由于需要对检测器进行低温冷却，它们的使用变得复杂。闪烁探测器光谱测定系统被认为是能够产生令人满意的结果，特别是在成本的一小部分的自然背景测量。本文叙述了在里海南岸选定地区应用NaI（Tl）闪烁和HPGe固体系统原位测量40 K、226 Ra、232 Th和137 Cs土壤总量的对比研究，并结合该地区土壤样品的实验室分析结果进行了沿着。根据现场测量结果和现场经验，得出的结论是，NaI（Tl）光谱系统提供了令人满意的结果，甚至可以通过结合特殊的光谱分析技术，是相对便宜，操作更容易进行比HPGe系统或直接基于实验室的土壤样品的分析。
Natural radionuclides present in soil as well as certain anthropogenic radionuclides released to the environment are the major contributors to terrestrial outdoor exposures. In the assessment of human exposures from environmental radioactivity, besides the conventional method of soil and vegetation sampling combined with laboratory based analyses of environmental media, the other choice would be field spectrometry which is a rapid, efficient and economical means of identification of radionuclides in the environment. Newly developed high resolution solid state gamma-ray detectors provide a state of art means for such a purpose. However, they are relatively expensive, may not provide the highest intrinsic efficiency possible and their use is complicated by the need for cryogenic cooling of the detector. Scintillation detector spectrometry systems are considered to be capable of yielding satisfactory results particularly for natural background measurements at a fraction of cost. This paper describes a comparative study on application of NaI(Tl) scintillation and HPGe solid state systems for in-situ measurements of 40K, 226Ra, 232Th and 137Cs soil inventories at selected regions on the south coast of Caspian Sea, along with the results from laboratory analyses of collected soil samples in the area. Based on in-situ measurement results and field experience, it is concluded that NaI(Tl) spectrometry system provide satisfactory results which might be even improved by incorporating special spectrum analysis techniques, is relatively less expensive and is operationally easier to carry out than either HPGe system or direct laboratory based analyses of soil samples.