摘要
建立高放废液中^(90)Sr的测定方法。以HDEHP萃取,除去大量的稀土,再以PMBP萃取Sr,反萃液以Fe(OH)_3沉淀清扫得以进一步纯化。放置含^(90)Sr的上层清液待^(90)Sr-^(90)Y达到平衡后,以Y_2(C_2O_4)_3形式沉淀,测量^(90)Y的活度,再换算成^(90)Sr的活度。分析程序对^(90)Y的回收率>97%。
The method determining the specific radioactivity of ^(90)Sr in high-level liquid waste is set up. It is composed of extraction with 0.5 mol/l HDEHP-n-heptane RE from 0.1 mol/l HNO_3 aqueous solution. extraction Sr from the aqueous solution which acidity was adjusted to pH6. 3—6.5 by adding NaOH and NH_4Ac-HAc buffer with 0.1 mol/I PMBP-1 mol/I TBP-Xylene. reextraction Sr from the organic phase with 6% HCOONa-HCOOH, clearing RE with Fe(OH)_3 precipittor and counting the counts of^(90) Y of Y_2(C_2O_4)_3 from which calculating the radioactivity of ^(90)Sr.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1992年第5期75-80,共6页
Atomic Energy Science and Technology
关键词
高放废液
萃取
锶90
^(90)Sr. High-level liquid waste.
