Abstract: The proficiency testing project for the analysis of gamma nuclides in biological ash was designed and implemented. The results of homogeneity and stability were analyzed by one-way ANOVA and t-test and the results submitted by the participant laboratories were evaluated by z-value. The results showed that the homogeneity and stability of the sample met the requirements for proficiency testing, the results of the participant laboratories were satisfactory, and the participant laboratories were able to accurately measure the activity concentration of gamma nuclides in biological ash.

Key words: biological ash, gamma nuclide, proficiency testing