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本工作采用氨水沉淀除铀,清液送反应堆照射,然后用银离子沉淀氯,Ge(Lj)探测器测量。该方法回收率(5次回收率平均值)为94％,相对误差在±15％以内。 1.操作步骤 (1) 样品的预处理 取铀浓度为～300mg/ml的UF_6水解液0.6ml于萃取管中,滴加5N NH_4OH至溶液pH>4,把萃取管放入80～100℃热水中,加热后再加入5N NH_4OH,使总体积为3.5～4.0ml,离心2分钟,取出清液于聚四氟乙烯烧杯中浓缩,蒸至体积为0.3ml时,定量转移到聚乙烯管中,经液氮冷冻,热
This work uses ammonia precipitation in addition to uranium, clear liquid sent to the reactor irradiation, and then silver ion precipitation of chlorine, Ge (Lj) detector measurement. The method recovery (average of 5 recovery) was 94%, the relative error within ± 15%. 1. Procedure (1) Sample Pretreatment Take 0.6 ml of UF 6 hydrolyzate with uranium concentration of ~ 300 mg / ml in the extraction tube, add 5N NH 4 OH dropwise to the solution pH> 4, place the extraction tube in 80-100 ° C heat Water, then add 5N NH 4 OH after heating, the total volume of 3.5 ~ 4.0ml, centrifuged for 2 minutes, remove the supernatant was concentrated in a Teflon beaker, steaming to a volume of 0.3ml, the quantitative transfer to a polyethylene tube , Liquid nitrogen frozen, heat