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.
出处
《核化学与放射化学》
EI
CAS
CSCD
北大核心
2007年第4期216-219,共4页
Journal of Nuclear and Radiochemistry
