山西、河南三地土壤样品中^(239+240)Pu、^(137)Cs分析  

^(239+240)Pu and ^(137)Cs in Soils of Three Sites from Shanxi and Henan

作　　者：王煜[1,2] 王卫宪[1,2] 申茂泉[2] 田梅[2] 周旭[2] 吴王锁[1] 金玉仁[2] 

机构地区：[1]兰州大学放射化学研究所,兰州730000 [2]西北核技术研究所,西安710024

出　　处：《辐射防护》2013年第2期124-128,共5页Radiation Protection

摘　　要：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。The^ 239＋240pu activities and 240pu/239pu atom ratios in the soil core samples （0--30 cm） collected from three sites in central China were analyzed using ICP - MS with the depth distribution of ^239＋240Pu and 137Cs also investigated. In the three soil core samples, ^239＋240pu activities in the surface layers （0--2 cm） ranged from 0.078 to 0. 122 mBq/g, 137 Cs ranged from 1.56 to 2.91 mBq/g, and the activity decrease with the depths. ^240pu/^239pu atom ratios mean value was 0. 188 ＋0. 016（the value from global fallout was 0. 180 ± 0.014）, and 137Cs/^239 ＋240pu activity ratios were 34.61 ＋ 5.91 （in july of 1998 ,the global fallout ratio was 34 ＋ 4）. The 137Cs and^ 239＋240Pu activities and ratios were at the same level with the same latitude global fallout confirming that the source of these radionuclides was global fallout.

关 键 词：239+240Pu 137Cs 土壤 240pu/239pu原子比 137Cs/239+240Pu活度比 

分 类 号：X833[环境科学与工程—环境工程]