摘要
建立了离子交换法与沉淀法相结合的、从高放废液中分离79Se的放化流程。该流程具有去污效果好的特点,对137Cs,90Sr,90Y,99Tc,154Eu的去污因子大于104,对125Sb,113Sn的去污因子大于103,对237Np为2×102。整个流程的收率约为53%。由该流程分离出的79Se样品能够很好地满足液闪测量和质谱测量的要求。
A radiochemical procedure for separation of ^79Se from HLLW based on ion-exchange chromatography and precipitation is developed. The HLLW sample is first loaded to an anion exchangecolumn and then eluted with 8 mol/L HCl. The effluent is transferred to 0.75 mol/L HNO3 medium, and then let it pass a mixed ion exchange column and eluted with 0.3 mol/L HNO3. After addition of Na2SeO3 carrier and holdback carriers for ^137Cs, ^90Sr, ^125Sb, etc. , the ^79Se is precipitated with Na2SO3 as elemental Se from the effluent. After washing, the Se precipitate is dissolved in nitric acid. Aliquots of the final solution are measured by HPGe gamma spectrometry, liquid scintillation spectrometry and ICP-MS. The decontamination factors for interfering radionuclides are estimated. The final recovered ^79Se is roved to be raiochemically pure. The overall recovery for ^79Se is about 53%.
出处
《核化学与放射化学》
EI
CAS
CSCD
北大核心
2005年第4期203-209,共7页
Journal of Nuclear and Radiochemistry
关键词
^79Se
分离
离子交换
沉淀
^79Se
separation
ion exchange chromatography
precipitation
