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目的探讨食品中放射性核素~(137)Cs(Cesium-137)在不同条件下检测方法的选择。方法选取秦山核电站和三门核电站周边地区及对照区域(杭州和舟山)共48份食品样品,分别采用γ能谱法和磷酸钼铵法检测137Cs,对两种方法的检测结果、探测限、检验周期、样品用量、灵敏度以及干扰因素等进行分析。结果两种方法检测样品~(137)Cs结果值的差值均数差异无统计学意义(P>0.05);γ能谱法探测限低于磷酸钼铵法,差异有统计学意义(P<0.05);γ能谱法一次可检测多种核素,但需用样品量大,检测周期较长;磷酸钼铵法探测限高,但化学处理步骤繁琐,容易被~(134)Cs干扰。结论应根据检测目的和食品种类选择~(137)Cs检测方法,在实际工作中大部分食品检测建议采用γ能谱法,而样品较难采集、出灰量较少或低含量的食品建议采用磷酸钼铵法检测。
Objective To investigate the method of determination of radionuclide (137) Cs (Cesium-137) in food under different conditions. Methods A total of 48 food samples from Qinshan Nuclear Power Station and Sanmen NPP surrounding area and the control area (Hangzhou and Zhoushan) were selected and 137Cs were detected by gamma spectrometry and ammonium molybdate phosphate method respectively. The detection results, detection limits, Cycle, sample amount, sensitivity and interference factors such as analysis. Results There was no significant difference in the mean value of 137 Cs between the two methods (P> 0.05). The limit of detection by gamma spectrometry was lower than that of molybdophosphate (P < 0.05). However, γ-ray spectrometry can detect many kinds of radionuclides at one time, but the amount of sample required is large and the detection period is longer. The detection limit of molybdenum phosphate method is high, but the chemical treatment steps are cumbersome and easily disturbed by 134 Cs. Conclusion The method of ~ (137) Cs should be selected according to the purpose of testing and the type of food. In most practical food testing, gamma spectrometry is suggested, while the samples are harder to collect and the output with less or low ash content is recommended Determination of molybdate phosphate method.