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应用改进的磷钼酸铵(AMP)富集法吸附、富集海水中的137Cs,并采用γ谱仪进行测量。结果表明,改进磷钼酸铵法最佳的实验条件为:量取20～100 L海水样品,调节pH 1.2～3.3,按每5 L水样50 mg、1 g的比例分别先后加入铯载体和40～60目的磷钼酸铵(AMP),通入30 L/min的气泡搅拌30 min,放置澄清4 h以上(一般放置时间不超过24 h)。用改进磷钼酸铵法取40 L海水样品进行实验时,铯的化学回收率93%～100%,放射性137Cs回收率94%～102%。γ能谱法测定海水中137Cs分析结果和β计数法进行比较,两者在t检验上没有显著性差异,证明γ能谱法测定大体积海水中137Cs的方法是可行的。
Adsorption and enrichment of 137Cs in seawater by modified ammonium phosphomolybdate (AMP) method were used to measure the concentration of 137Cs. The results showed that the best experimental conditions for the ammonium phosphomolybdate method were as follows: measuring 20 ~ 100 L seawater samples, adjusting the pH to 1.2 ~ 3.3, adding 5% 40 ~ 60 mesh ammonium phosphomolybdate (AMP), through a bubble of 30 L / min stirring 30 min, place the clarification for more than 4 h (usually placed in no more than 24 h). With the improved ammonium phosphomolybdate method for 40 L seawater samples for the experiment, the chemical recovery of cesium 93% to 100%, radioactive 137Cs recovery of 94% to 102%. γ spectrometry method for the determination of 137Cs in seawater and β count method were compared. There was no significant difference between t-test and γ-ray spectrometry. It was proved that γ-ray spectrometry was feasible for the determination of 137Cs in large volume of seawater.