TEVA树脂萃取色层法分析土壤样品中的<sup>99</sup>Tc

TEVA树脂萃取色层法分析土壤样品中的⁹⁹Tc

摘要: 针对土壤中⁹⁹Tc的分析，以TEVA树脂萃取色层为主要分离纯化手段，以液闪谱仪为放射性测量手段，建立了一个简便快速的分析方法。方法全流程对模拟土壤样品中⁹⁹Tc的化学收率大于90%，对常见的沾污核素¹³⁷Cs、⁹⁰Sr-⁹⁰Y及天然铀均有较高的去污因子。样品量为10 g、液闪测量时间为1h时，方法的最小可探测浓度为3.5 mBq/g，可以满足大多数环境样品分析的需要。

Abstract: In this study, a chemical procedure for the routine determination of ⁹⁹Tc in soils has been developed. The soil samples are leached with 1 mol/L nitric acid and separated using TEVA resin prior to liquid scintillation counting. Each sample was analyzed with and without a ⁹⁹Tc spike to determine chemical recovery. The chemical recovery of the method is greater than 90%. With the quantity 10 g and counting time 1 h, the minimum detectable concentration is 3.5 mBq/g. The presence of ¹³⁷Cs, ⁹⁰Sr-⁹⁰Y and natural uranium doesn’t interfere with the procedure.