1. Fujitaka, K. (1995). External dose due to natural radiation in Japan. `Human life with environmental radiation — collective effective dose from natural and man-made radiation sources', Proceedings of the 22nd National Institute of radiological sciences seminar on environmental research, Chiba, December 1–2, 1994. Chiba: National Institute of Radiological Sciences (in Japanese).
2. Hanna, S. R., Briggs, G. A., & Hosker, Jr. R. P. (1982). Handbook on atmospheric diffusion. Technical Information Centre, US Department of Energy.
3. Krypton-85 pollution and atmospheric electricity;Harrison;Atmospheric Environment,1994
4. Atmospheric distribution of 85Kr simulated with a general circulation model;Jacob;Journal of Geophysical Research,1987
5. Japan Nuclear Cycle Development Institute (JNC) (1999). JNC Technical report. JNC TN8450 99-01 (in Japanese).