2020 年 19 巻 1 号 p. 15-22
The aim of this study is to report our experiences we had on decommissioning of four unsealed radioisotopes facilities during five years, 2010-2015. In this study, we investigated not only the relationship between decommissioning cost and facility's scale or radioisotope use, but also the purpose and cost of facility renovation. In addition, the problems conducting decommissioning of the facilities and the effect were also done a survey for the radiation protection supervisors or safety manager.