186Os和188Os双同位素溶液的制备及其中Os同位素丰度与含量的标定

在核反应堆中辐照高纯铼金属带 ,185Re和187Re通过 (n ,γ)反应后 ,经 β衰变产生186Os和188Os ,用H2 O2 和H2 SO4 将Re带溶解并同时将186Os和188Os蒸馏出 ,首先用 2 0 %NaOH溶液吸收 ,然后再将碱吸收液重新蒸馏 ,最后将186Os和188Os混合同位素保存在 2 5 %HCl介质中 ,用负离子热电离质谱仪 (NTIMS)标定其含量及同位素丰度。结果表明 ,91.4mg的高纯铼金属带 ,在辐照的累积通量为 1.32× 10 18n/cm2时 ,可产生Os 8.46 μg ,其186Os和188Os的同位素丰度分别为 6 0 .89%和 38.6 3%

Preparation and Calibration of Solution of Mixed Isotopes of 186Os and 188Os

The process of preparation of the solution of mixed isotopes of186Os and 188Os in addition to calibration of osmium in it was described. High pure metal rhenium filament was irradiated in reactor and then dissolved in dilute H2O2 and H2SO4 after nearly 5 months decay. Distilled 186Os and 188Os were trapped in 20% NaOH and then distilled again. Finally, 186Os and 188Os were reserved in 25% HCl medium. Negative ion therminoization mass spectrometry was used to measure the abundance and content of osmium in the solution. The final result showed that 91.4 mg Re could yield 8.46 μg Os in which the abundance of 186Os and 188Os were 60.89% and 38.63%, respectively, when integral influx was 1.32×1018 n/cm2.