大量~(238)Pu中微量~(237)Np的测定

ANALYSIS OF ~(237)Np IN AN EXCESS OF ~(238)Pu

摘要: <正> 一、绪言关于镎的分析方法,国内外都进行了大量的工作,报道的文献也很多1—3,而经常采用的有:(1)放化测量法,这是最常用的一种方法,尽管~(237)Np的比放比较低(1.56×10~3衰变/μg·min),但计数法还是比化学法,化学光谱法灵敏。(2)分光光度法,此法虽然比放化测量灵敏度稍低,但是在含镎的样品中,往往总是伴随有其它α放射性元素,而这些杂质元素比放经常比镎要强得多,因此采用α计数法测量镎时,对其它杂质要求有很

Abstract: The sample is dissolved in HNO_3 and the Pu and Np in the solution isreduced to Pu(III) and Np(IV) by ferrous sulphamate. Np(IV) is then extractedwith TTA-toluene and back-extracted by 8mol/l HCl. Ferrous ion and arsenazo III isthen added for photospectrometric determaination at 665 nm. The molar absorbanceis 6.3×10~4 and the detection limit is 0.1--0.35 microgram Np with a relativestandard deviation of ±3%.