The aim of this study was to establish an e-learning training system for radiation disaster management in order to effectively train and secure personnel for radiation disasters, independent of regional characteristics such as the presence or absence of nuclear facilities. An educational management tool was used to enable verification of the educational effects through on-demand videos and pre- and post-training tests based on standardized textbooks created by the government. This training was conducted for radiological technologists affiliated with the National Hospital Organization. The educational effects were analyzed based on the results of the pre- and post-training tests. The developed e-learning training system included on-demand videos, provision of PDF materials, implementation of pre- and post-tests, confirmation of attendance, and performance management. Of the 65 trainees, 59 completed all the lectures and tests. The correct answer rate of the pre-training test was 57.8 ± 19.0%, while that of the post-training test was 85.9 ± 12.5%. This study established the first-of-its-kind e-learning training system for radiation disaster management in Japan and participants received effective literacy education on radiation disaster management. The results showed that training can be conducted regardless of location, thereby facilitating effective training and securing of personnel.

The standard related to surface contamination in controlled areas is called as the surface contamination limit and one-tenth of the surface contamination limit is used as the criterion for determining the contamination level when target materials are removed from a controlled area. The values of the surface contamination limit for the removal of target materials are 0.4 Bq/cm² for alpha emitters and 4 Bq/cm² for non-alpha emitters, which are widely used in radiological protection in nuclear and RI facilities in Japan. It is pointed out that there is a considerable degree of conservatism in deriving those values; however, its background basis is not well investigated or discussed. In this study, we attempted to clarify the derivation of surface contamination standards by examining the assumed scenarios, the utilized data and the recent estimations of surface contamination standards related to clearance levels.