1. 1) Japan Radioisotope Association; Radioisotope Pocket Data Book 12th edition (2020) (in Japanese).
2. 2) United Nations Scientific Committee on the Effects of Atomic Radiation; Scientific Annex F: Exposures resulting from nuclear power production, UNSCEAR 1982 Report (1982).
3. 3) International Commission on Radiological Protection; Age-dependent Doses to Members of the Public from Intake of Radionuclides: Part 4 Inhalation Dose Coefficient, Publication 71 (2019).
4. 4) United Nations Scientific Committee on the Effects of Atomic Radiation; Scientific Annex J: Exposures and effects of the Chernobyl accident, UNSCEAR 2000 Report (2000).
5. 5) United Nations Scientific Committee on the Effects of Atomic Radiation; Scientific Annex A: Levels and effects of radiation exposure due to the nuclear accident after the 2011 great east-Japan earthquake and tsunami,UNSCEAR 2013 Report (2013).