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本文叙述了环境生物样品中铯-137的测定方法。经炭化灰化的样品,加入铯载体,用酸浸取,然后用亚铁氰化钴钾(KCFC)选择性吸附铯,在450℃下灼烧KCFC,用水浸取并蒸至3毫升左右,以碘铋酸铯形式沉淀铯,制源,用低本底β测量仪测定铯-137的放射性。本法最小可测限度1×10~(-13)居里/公斤鲜重,铯的化学产额为70—90%,铯的化学产额与放化产额基本一致,两产额比值的平均值为100.4%,对钾-40的去污因子大于10~4,对铷-87的去污因子约为10~4,对新、老裂变产物的去污因子达10~3以上,对放射性铯比放为10~(-12)居里/公斤鲜重的环境生物样品,精密度约为±13%。大量实验证明,适用于各种环境样品中铯-137含量的测定。方法简单快速,容易掌握,能得到满意的结果。
This article describes the determination of cesium-137 in biological samples. The carbonized ashing sample was added cesium carrier, leached with acid, and then with potassium ferrocyanide (KCFC) selective adsorption of cesium, burning at 450 ℃ KCFC, leaching and steaming to about 3 ml, The cesium was precipitated as cesium iodide bismuth, and the source was determined. The radioactivity of cesium-137 was measured using a low background beta meter. The minimum detectable limit of this Law is 1 × 10 ~ (-13) Curie / kg fresh weight, the chemical yield of cesium is 70-90%, the chemical yield of cesium is basically the same as the yield of radiochemicals, The average value is 100.4%, the decontamination factor for potassium-40 is greater than 10-4, the decontamination factor for rubidium-87 is about 10-4, and the decontamination factor for new and old fission products is 10-3 or more. Radioactive cesium than put 10 ~ (-12) Curie / kg fresh weight of environmental biological samples, the precision of about ± 13%. A large number of experiments show that for a variety of environmental samples in the determination of cesium-137 content. Method is simple and quick, easy to grasp, can get satisfactory results.