Development of a calculation system for the estimation of decontamination effect

Satoh, Daiki   ; Kojima, Kensuke; Oizumi, Akito   ; Matsuda, Norihiro  ; Iwamoto, Hiroki   ; Kugo, Teruhiko ; Sakamoto, Yukio*; Endo, Akira   ; Okajima, Shigeaki  

A calculation system for the estimation of decontamination effect (CDE) has been developed to support planning a rational and effective decontamination. The method calculates the dose-rate distribution before and after decontamination, according to the distribution of radioactivity and the decontamination factor (DF), and uses a dose rate reduction factor (DRRF) to estimate the decontamination effect. The results that were calculated by using the CDE were compared with the results of measurements as well as with the results of calculations that were performed using a Monte Carlo particle transport code PHITS. It was found that the CDE successfully reproduced the measured as well as the calculated dose-rate distributions, requiring less than several seconds of calculation time.