【摘要】 本文在我国国标GB6766-86《水中锶-90放射化学分析方法———二-(2-乙基己基)磷酸萃取色层法》的基础上,对海水中90Sr的分析方法进行了研究,重点对其沉淀浓集方法进行了研究。结果表明:采用的沉淀剂为(NH4)2CO3和NH4Cl的混合物,沉淀量适宜;在后续步骤与国标相同的情况下,方法的放射性回收率与化学回收率均为30%~50%,两者具有较好的一致性;方法的探测限为4.1×10-4Bq/L,比目前海水中90Sr放射性浓度水平约低一个量级。本方法基本可以满足海水中90Sr的测量要求。更多还原

【Abstract】 This paper studied analytical method of strontium-90 in sea water,based on GB 6766-86(Radiochemical analysis of Strontium-90 in water extraction chromatography by di-(2-Ethylhexyl) phosphoric Acid).The key to the study is the precipitation of seawater sample.The results showed that,the best precipitating agents for sea water strontium’s measurement is the mixture of(NH4)2CO3 and NH4Cl;the radioactive recovery and the chemical recovery is between 30% and 50%,the uniformity is quite good;The detecable limit of this method is 4.1×10-4 Bq/L,lower than the present strontium-90 radioactivity concentration in sea water by one order of magnitude.更多还原