^(242)Pu同位素稀释剂的标定  

Determination of the Specific Activity and Isotope Ratios of ^(242)Pu Spike Solution

作　　者：伊小伟[1] 李冬梅[1] 徐江[1] 施燕梅[1] 李小侠[1] 张海涛[1] 党海军[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《核化学与放射化学》2007年第4期216-219,共4页Journal of Nuclear and Radiochemistry

摘　　要：首先用^(238)Pu同位素稀释法标定了四水硫酸钚中^(289)Pu的比活度,再用该^(239)Pu溶液作稀释剂,对^(242)Pu稀释剂进行标定,得到^(242)Pu的比活度平均值为1304 Bq/g,相对合成标准不确定度为1.4%。钚的同位素丰度比(R(^(239)Pu/^(242)Pu))为0.002 26,相对合成标准不确定度为4%;R(^(240)Pu/^(242)Pu)为0.0172,相对合成标准不确定度为1%。The ^242 Pu spike solution is usually employed to determine the specific activity of plutonium in environmental samples. A ^239 Pu（SO4 ）2 . 4H2O solution, whose specific activity was determined by using ^238 Pu isotope dilution method, was in turn used as isotope dilute to determine the specific activity and isotope ratios of a ^242Pu spike solution. The specific activity of ^242Pu spike solution is 1 304 Bq/g, and the relative combined standard uncertainty is 1.4%. R（^239Pu/^242Pu） is 0. 002 26, and the relative combined standard uncertainty is 4%; R（^240Pu/^242Pu） is 0.017 2, and the relative combined standard uncertainty is 1 %. The method of the determination of ^242 Pu specific activity using ^239 Pu isotope dilution is proved feasible.

关 键 词：^242Pu稀释剂 标定 同位素稀释法 

分 类 号：O614.35[理学—无机化学]