γ能谱法分析土壤样品中几种人工放射性核素的活度  

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

作　　者：张佳媚[1] 师全林[1] 白涛[1] 金玉仁[1] 李冬梅[1] 

机构地区：[1]西北核技术研究所,陕西西安710024

出　　处：《同位素》2005年第1期102-107,共6页Journal of Isotopes

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(0.42 mm)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5 cm的土层,而137Cs、152Eu在20～30 cm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.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.

关 键 词：土壤 人工放射性核素 活度 Γ能谱 

分 类 号：TL817.2[核科学技术—核技术及应用]