【摘要】 本文给出了食品中²³⁷Np 和²³⁹pu 的同时分析方法,该方法用草酸钙浓集,用三正辛胺（TOA）从8N 盐酸体系中萃取,然后电沉积制源,在低本底α谱仪上测定。本方法对²³⁷7Np 和²³⁹Pu 的全程回收率分别为（80.1±9.6）%、（75.2±7.8）%;灵敏度分别为6.0×10^-16、6.1×10^-16Ci/g（灰）。本文还给出了五种食品中²³⁷Np 和²³⁹Pu 的分析结果。更多还原

【Abstract】 A method for simultaneous determination of ²³⁷Np and²³⁹pu in foods was developed.Neptunium and plutonium in samples wereconcentrated by copreciPitation with calcium oxalate.Np（Ⅳ） and Pu（Ⅳ）were extracted with 10% tri-n-octylamine（TOA）-20% acetone-70% xylenefrom 8N hydrochloric acid.The samples for counting were prepared byelectrodeposition.The activities of ²³⁷Np and ²³⁹Pu were measured with alow background alpha spectrometer.The recoveries of ²³⁷Np and ²³⁹Pufrom 5 g of food ash are（80.1±9.6）%and（75.2±7.8）%,respectively.The lower limits of determination for ²³⁷Np and ²³⁹Pu are 6.0×10^-16and6.1×10^-10Ci/g（ash）respectively,these satisfy the needs for analysis of²³⁷Np and ²³⁹Pu in foods.The analytical results for five kinds of foodsare presented.更多还原