Abstract：ObjectiveA selectivity study was conducted through the examination of radionuclides 137Cs (Cesium-137) for food based on different detection conditions.MethodsA total of 48 food samples were selected from three areas including Qinshan nuclear power plant, Sanmen nuclear power plant and Hangzhou and Zhoushan respectively.137Cs of these samples were determined by γ spectrometry and Phosphoric acid ammonium molybdate method. The level of 48 foods were statistically analyzed, and then the time consuming, sample size requirements, influence factors were comprehensively discussed, thus the selection reference proposal of the examination method could be provided.ResultsThere were no significant difference for the data of two examination method (P>0.05). The limit of detection of the γ spectrometry was lower (P<0.05). Compared with Phosphoric acid ammonium molybdate method, γ spectrometry had lower limit of detection, and could detect a variety of radionuclides at a time, but need more sample and time-consuming when multi-sample were detected. The limit of detection of the Phosphoric acid ammonium molybdate method was high, and the chemical processing steps were cumbersome and was easy to be interfered by 134Cs.ConclusionThe limit of detection of the γ spectrometry is low, and the sensitivity of the Phosphoric acid ammonium molybdate method is high. Most food are recommended to be detected by γ spectrometry in the practical work, and the food which were difficult collected, less ash or low content,are recommended to be detected by Phosphoric acid ammonium molybdate method.
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