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239+240Pu and 137Cs in Soils of Three Sites from Shanxi and Henan
Author(s): 
Pages: 124-128
Year: Issue:  2
Journal: Radiation Protection

Keyword:  239+240Pu 137Cs 土壤 240Pu/239Pu原子比 137Cs/239+240Pu活度比;
Abstract: 采用电感耦合等离子体质谱(ICP-MS)分析了中国中部地区三地(山西长治、河南濮阳和商丘)钻芯(0~30 cm)土壤样品中的239+240 Pu活度浓度和240Pu/239 Pu同位素比值,并对239+240 Pu和137 Cs在土壤中的深度分布进行了研究。结果表明,三地表层土壤(0~2 cm)中239+240 Pu活度浓度为0.078~0.122mBq/g,137 Cs为1.56~2.91 mBq/g,且浓度整体随深度增加而降低;240 Pu/239 Pu原子比的平均值为0.188±0.016(全球沉降平均值为0.180±0.014),137 Cs/239+240 Pu活度比值为34.61±5.91(1998年7月,全球沉降平均值为34±4)。三地土壤中放射性核素137 Cs、239+240 Pu浓度及钚同位素比值均与全球沉降值相当,说明其来源可能属于全球沉降。
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