2025 Volume 60 Issue 2 Pages 156-170
The authors release a homemade code named DIRAP (Dosimetry for Inhaled Radon Progeny), which is used to calculate the effective dose per exposure to 222Rn progeny. The accuracy of the code was verified by comparing its calculations to the values reported in ICRP publications for the adult Reference Person engaged in light work. This code can also calculate the doses for the adult Reference Person at the four reference levels of physical exertion: sleep, sitting, light exercise and heavy exercise. A copy of the source code is available in text format by contacting one of the authors via email at dirap@qst.go.jp.