Radioactivity evaluation method, radioactivity evaluation program and radioactivity evaluation device

摘要

PROBLEM TO BE SOLVED: To provide a radioactivity evaluation method capable of appropriately evaluating a radioactivity concentration from the viewpoint of maintainability of evaluation. SOLUTION: The radioactivity evaluation method includes a radioactivity concentration calculation step (S4) for calculating the radioactivity concentration of a measurement object, an error calculation step (S5) for calculating a relative error σ'D of the radioactivity concentration, and the like. The error calculation step (S5) includes the evaluation step (S6) for evaluating the radioactivity concentration in consideration of the uncertainty based on the relative error σ'D of the radioactivity concentration, and the error calculation step (S5) is caused by the measurement process of the gross count rate. The gross error calculation step (S51), which calculates the error σcG of the gross count rate by superimposing a plurality of gross errors, and the multiple BG errors caused by the measurement process of the measured BG count rate and the estimation process of the estimated BG count rate are superimposed. Based on the BG error calculation step (S52) for calculating the error σcBG of the estimated BG count rate, the error σcG of the gross count rate, and the error σcBG of the estimated BG count rate, the relative error σ'Cn of the net count rate Includes a net count rate error step (S53) for calculating. [Selection diagram] Fig. 3