【摘要】 本文介绍环境水样品中¹³¹I、¹²⁵I 的测定方法。采用强碱性阴离子交换树脂浓集,CCl₄萃取,最后制成 AgI 沉淀源,由低本底β计数器和γ谱仪及 X 射线谱仪测定。本方法灵敏度对¹³¹I 为7.7×10^-14Ci/1（2.8Bq/m³）,对¹²⁵I 为0.578×10^-12Ci/1（21.4Bq/m³）。对环境中地下水、水库水、海水各取5—101,加入¹³¹I 强度2.8×10^-12Ci/1（0.1Bq）,试验结果其化学回收率分别为75—80%,放化回收率与化学回收率相符合。本方法对¹⁰⁶Ru-¹⁰⁶Rh 核素和总裂片的去污系数在1.2×10⁵以上。10小时可分析6个样品。更多还原

【Abstract】 This paper describes a method for determining ¹³¹I and ¹²⁵Iin environmental water sample.The sample was concentrated with an anionexchange resin and the eluete from the resin was extracted with CCl₄.A AgIsource was prepared by precipitation and measured with a low backgroundfacility and a r-ray spectroscopy.The sensitivity of this method for determi-ning ¹³¹I and ¹²⁵I is 7.7×10^-14Ci/1（2.8 Bq/M³）and 0.578×10^-12Ci/1（21.4Bq/M³）,respectively.5—10 1 of water samples（underground water,reservoir water or sea water）were collected,and some 60 dpm(2.8x10^-12Ci/1)of ¹³¹I as radiotracer were added.The results show that the chemicalrecovery is 75—80%.The radioehemical yield is in agreement with chemicalreeoveryr rate.Using this method,the decontamination coefficient fo ¹⁰⁶Ru-¹⁰⁰Rh and fission product is above 1.2×10⁵.It takes 10 hours to analyseSix samples.更多还原