奶粉中60Co、137Cs和90Sr测量的实验室间比对结果

目的 为了提高全国重点辐射环境实验室对食品中⁹⁰Sr和⁶⁰Co、¹³⁷Cs的分析监测水平。方法 组织全国重点辐射环境实验室开展奶粉⁹⁰Sr和⁶⁰Co、¹³⁷Cs标准样品的比对。比对结果采用参考值的相对偏差进行判定。结果 参加奶粉样品⁹⁰Sr比对的实验室8个，相对偏差小于10%，占25%；10%～20%，占12.5%；20%～30%，占62.5%；参加奶粉样品⁶⁰Co、¹³⁷Cs比对的实验室14个，其中⁶⁰Co：相对偏差小于10%，占85.7%；10%～20%，占14.3%；¹³⁷Cs：相对偏差小于10%，占71.4%；10%～20%，占28.6%。整体比对结果可以接受。结论 参加本次比对的实验室，整体比对结果良好。

Intercomparison of milk powder 90Sr, 60Co and 137Cs analysis among laboratories

Objective In order to improve the analysis and monitoring level of ⁹⁰Sr, ⁶⁰Co and ¹³⁷Cs in food in the national key radiation environmental laboratories.Methods Organize national key radiation environmental laboratories to compare milk powder ⁹⁰Sr, ⁶⁰Co and ¹³⁷Cs standard samples. The comparison result was judged by the relative deviation of the reference value.Results Milk ⁹⁰Sr samples were compared within 8 laboratories, the relative deviation was less than 10%, accounting for 25%; 10%～20%, accounting for 12.5%; 20%～30%, accounting for 62.5%. Milk ⁶⁰Co、¹³⁷Cs samples were compared within 14 laboratories, ⁶⁰Co: relative deviation was less than 10%, accounting for 85.7%; 10%～20%, accounting for 14.3%; ¹³⁷Cs: relative deviation was less than 10%, accounting for 71.4%; 10%～20%, 28.6%. The overall comparison result is acceptable.Conclusion The laboratories participating in this comparison have good overall comparison results.