γ能谱法分析土壤样品中几种人工放射性核素的活度

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详细信息

Radioactivity Determination of Several Man-made Radionuclides in Soil Samples by γ Spectrometry

ZHANG Jia-mei, SHI Quan-lin, BAI Tao, JIN Yu-ren, LI Dong-mei (Northwest Institute of Nuclear Technology, Xi’an 710024, China)

摘要: 采用γ能谱法对一批放射性污染的环境土壤样品进行了定量分析。结果表明,不同磨样条件和样品放置方式对测量结果有一定影响,样品磨样过40目(0.42mm)筛子一般可满足均匀性要求;但241Am核素在有些样品中的分布很不均匀,平行样品间的差异较大;241Am主要分布在表面5cm的土层,而137Cs、152Eu在20~30cm深的土层仍可探测到。从不同地点所取的土样中154Eu与152Eu活度比基本一致,约0.07。
- 土壤 /
- 人工放射性核素 /
- 活度 /
- γ能谱
Abstract: Surface and core soil samples collected from a radioactively contaminated region are analyzed by γ spectrometry. Soil is milled and sieved then contained with cylindrical plastic boxes (φ 75 mm×50 mm). 137Cs, 152Eu and 60Co are approximately homogeneous in samples of 40 mesh (0.42 mm), but 241Am may not uniform even in samples of 60 mesh ( 0.25 mm). Peaks count are up to 10% different between box is lying up and down on the top of detector. 241Am is mainly found in topsoils (0～5 cm), whereas 137Cs or 152Eu is to 30 cm in depth. The activity ratios of 152Eu to 154Eu are basically same (0.07) between different locations.
- soil /
- man-made radionuclide /
- radioactivity /
- γ spectrometry

[1]	张佳媚,王中录,夏兵,等.HPGeγ谱仪分析环境水平放射性比对样品[J].核电子学与探测技术,2002,22(1):92~95.
[2]	于敏主编·中国军用放射性核素衰变纲图[M].北京:原子能出版社,2001.
[3]	Al Hamarneh I,Wreikat A,Toukan K.Radioac-tivity Concentrations of40K,134Cs,137Cs,90Sr,241Am,238Pu and239+240Pu Radionuclides in Jor-danian Soil Samples[J]·Journal of Environmental Radioactivity,2003,(67):53~67.
[4]	Carbol P,Solatie D,Erdmann N,et al.Deposi-tion and Distribution of Chernobyl Fallout Fission Products Actinides in a Russian Soil Profile[J]·Journal of Environmental Radioactivity,2003,(68):27~46.
[5]	GB11743-89,土壤中放射性核素的γ谱分析方法[S].
[6]	张佳媚,常永福,师全林,等.一台反康普顿HPGeγ谱仪的性能改造和应用[J]·核电子学与探测技术,2004,24(2):172~176.