【摘要】 报道了用同位素稀释质谱法测定U₃O₈中的痕量钍。用萃取色层法分离钍。同位素丰度质谱测定精密度为±0.1％。化学处理与质谱测定钍的流程空白值为9×10^-9g,方法检测限达到5×10^-9g,对于10^-6量级痕量钍的U₃O₈样品,测定结果相对标准误差为±3.5％。更多还原

【Abstract】 The determination of the trace thorium in U3O8 by isotope dilution mass spec-trometry method is introduced. Thorium is separated by extraction chromatogra-phy. The precision of the determination is iO. 1% for the ratio of thorium isotope abundance. The blank value of the whole analytic procedure is 9X10~9g and the detectable limit of thorium by this method is 5 X 10~9g. The relative standard deviation of determination for the trace thorium of 10~6 order in U3O8 is ?. 5%.更多还原