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huan jing kong qi zhong 239+240pu de fen xi ce ding
Author(s): 
Pages: 119-122
Year: Issue:  2
Journal: Radiation Protection

Keyword:  气溶胶239+240Pu萃取色层α谱仪;
Abstract: 建立了环境空气中239+240Pu的测量方法。该方法采用NF-2型滤膜采集空气样品5 000~10 000 m3,干法灰化,硝酸加热浸取钚,氨基磺酸亚铁和亚硝酸钠将钚转化为四价态,用三正辛胺—聚三氟氯乙烯粉萃取色层柱分离纯化钚,0.025 mol/L草酸—0.15 mol/L硝酸解吸,最后电沉积制源,在α谱仪上测量239+240Pu计数。通过实验确认了测量方法的主要条件和参数:电沉积制源极间距为4.0 mm,p H值为2.0;溶液萃取分离色层柱高度为6.0 cm,溶液流速2 m L/min;氧化还原时间为10 min。方法全程回收率为52.5%~82.5%,平均值68.3%;气溶胶样品量为10 000 m3时,方法探测下限为1.31×10-7Bq/m3。该方法可用于环境气溶胶中239+240Pu测量,采用本方法测定了我国西北某地区气溶胶中239+240Pu活度浓度,结果平均值为3.25×10-6Bq/m3。
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