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| Intercomparison of milk powder 90Sr, 60Co and 137Cs analysis among laboratories |
| LU Ying, LOU Hailin, LI Aiyun, TU Xingming, WANG Shaolin |
| China Institute of Atomic Energy, Beijing 102413 China |
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Abstract 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.
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Received: 18 May 2020
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