郑琪珊,黄丽华,吉艳琴.食品样品中低水平137 Cs活度浓度测量的两种方法比较[J].中华放射医学与防护杂志,2024,44(5):393-398
食品样品中低水平137 Cs活度浓度测量的两种方法比较
Comparison of two methods for determination of low level 137Cs activity concentration in food sample
投稿时间:2024-03-01  
DOI:10.3760/cma.j.cn112271-20240301-00081
中文关键词:  食品  137Cs  不确定度  探测下限
英文关键词:Food  137Cs  Uncertainty  Detection limit
基金项目:国家重点研发计划项目(2019YFC1604804)
作者单位E-mail
郑琪珊 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室, 北京 100088  
黄丽华 福建省职业病与化学中毒预防控制中心, 福州 350025  
吉艳琴 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室, 北京 100088 jiyanqin@nirp.chinacdc.cn 
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中文摘要:
      目的 比较食品中137Cs的γ能谱分析法和放射化学分析法,并探讨两种方法的适用性。方法 采用γ能谱分析方法和放射化学分析方法(磷钼酸铵分离-β计数法)测量不同类型食品中的137Cs,比较两种方法所需样品量、预处理制样过程以及测量探测下限,并以肉类样品为例,对比两种方法测量肉类样品中137Cs的活度浓度及不确定度评估。结果 能谱分析法与磷钼酸铵分离-β计数法的测量结果一致,两种方法测量肉类样品的相对扩展不确定度分别是18.0%和8.0%,γ能谱分析法样品制备简单,但样品用量大预处理过程耗时,磷钼酸铵分离-β计数法的样品用量小,但需要分离纯化过程,两种方法的探测下限分别是10.6 mBq/kg (样品质量11.7 kg)和5.1 mBq/kg (样品质量2.1 kg)。结论 两种方法测量食品中低水平137Cs结果一致,适用于食品中137Cs的监测。
英文摘要:
      Objective To study the applicability of conventional detection method, gamma spectrometry and radiochemical analysis, for the determination of 137Cs activity concentratons in food samples and to compare the difference of such two methods for this purpose. Methods By using both γ spectrometry and radiochemical analysis, the activity concentrations of 137Cs in different types of food were determined, to compare the required sample amounts, the sample pretreatment and preparation processes and the lower detection limits.With meat samples as a case study, the two method were compared for assessing the activity concentrations of 137Cs in meat samples and evaluating the uncertainties. Results The deviation of measurement result obtained in meat by using gamma spectrometry and ammonium phosphomolybdate-β counting method is consistent, with relative extended uncertainties of 18.0% and 8.0%, respectively. The pretreatment process for γ spectrometry is characterized by its simplicity, but large sample amount required and time-comsuming process, while the ammonium phosphomolybdate method requires a small amount of sample but in need of separation and purification process.The detection limits of the two methods are 10.6 mBq/kg (sample mass 11.7 kg) and 5.1 mBq/kg (sample sample 2.1 kg ), respectively. Conclusions The results of two methods for determinationf of the low activity concentrations of 137Cs in food samples are consistent. Therefore, when monitoring low activity concentrations of 137Cs in food samples, the appropriate detection method can be selected based on the specific objective and requirements of the monitoring study.
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