Radioactivity Determination of Several Man-made Radionuclides in Soil Samples by γ Spectrometry
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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。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.
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Keywords:
- soil /
- man-made radionuclide /
- radioactivity /
- γ spectrometry
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