Summarizing the intercomparison on the γ-ray spectrometry analysis of soil between China and Japan

Objective: To inspect and improve the measurement methods and quality of γ-ray spectrometry analysis. Methods: By the intercomparison on the measurement of 6 radionuclides, including 40K, 208Tl, 214Bi, 214Ph, 228Ac and 137Cs, in two soil samples with γ-ray spectrometry in three laboratories, JCAC in Japan, RMTC and our laboratory in China. Results: The maximum difference of the values measured by our laboratory is 4.1% related to the total average values, and the difference of the value of low activity nuclides 137Cs is 3.6%. The relative differences of all values meet the requirements. Conclusion: The measurement method which we take is correct, and the quality guarantee and control system of our laboratory is perfect and effective, and the results of our measurement are reliable. (authors)