Welcome to ERAN

What is ERAN?

ERAN (Environmental Radioactivity Research Network Center) consists of six organizations: CRiED ( Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba),  IER (Institute of Environmental Radioactivity, Fukushima University), and IREM (INSTITUTE OF RADIATION EMERGENCY MEDICINE, Hirosaki University) as network centers, and JAEA (Japan Atomic Energy Agency), QST (National Institutes for Quantum and Radiological Science and Technology), and NIES (National Institute for Environmental Studies) as cooperative network centers.
We are convinced that the results of the joint research and international efforts of these six organizations with their unique technologies and characteristics will be critical to the recovery and possible future events.

Pick Up Topic

Chemosphere Volume 239, January 2020, 124777

Impact of forest thinning on the dynamics of litterfall derived 137Cs deposits in coniferous forest floor after Fukushima accident
Teramage, M. T., Onda, Y., Kato, H., Sun, X. (2020) 

The effects of a 50% forest thinning intensity on Fukushima-derived 137Cs deposition by litterfall and its discharge by runoff in hillslope coniferous forest were monitored using four litterfall traps and a hillslope erosion plot. The observation was underway during the pre-and post-thinning periods. Results demonstrated that during the pre-thinning period a total 150 ± 13 g m−2 of litterfall deposited about 924 ± 69 Bq m−2 of 137Cs. This accounts for 11% of the local 137Cs fallout recorded for the study site in the aftermath of the accident. After thinning, both litterfall and 137Cs increased by more than six- and two-fold, respectively. 

Hot Topics by ERAN


Teramage, M. T., Onda, Y., Kato, H., Sun, X. Impact of forest thinning on the dynamics of litterfall derived 137Cs deposits in coniferous forest floor after Fukushima accident, Chemosphere Volume 239, January 2020, 124777


Igarashi, Y., Onda, Y., Smith, J., Obrizan, S., Kirieiev, S., Demianovych, V., Laptev, G., Bugai, D., Lisovyi, H., Konoplev, A., Zheleznyak, M., Wakiyama, Y., Nanba, K. Simulating dissolved 90Sr concentrations within a small catchment in the Chernobyl Exclusion Zone using a parametric hydrochemical model, Scientific Reports volume 10, Article number: 9818 (2020)


Tsumune, D., Tsubono, T., Misumi, K., TATEDA, Y., Toyoda, Y., Onda, Y., Aoyama, M. Impacts of direct release and river discharge on oceanic 137Cs derived from the Fukushima Dai-ichi Nuclear Power Plant accident, Journal of Environmental Radioactivity Volumes 214–215, April 2020, 106173


Taniguchi, K., Onda, Y., Smith, H.G., Blake, W., Yoshimura, K., Yamashiki, Y., Kuramoto, T., Saito, K. Transport and Redistribution of Radiocesium in Fukushima Fallout through Rivers, Environmental Science & Technology, 53, 21, 12339–12347, Sep, 2019


Huang, Z., Ni, Y., Wang, H., Zheng, J., Yamazaki, S., Sakaguchi, A., Long, X., Uchida, S. Simultaneous determination of ultra-trace level 237Np and Pu isotopes in soil and sediment samples by SF-ICP-MS with a single column chromatographic separation, Microchemical Journal, Volume 148, July 2019, Pages 597-604


Men, W., Zheng, J., Wang, H., Ni, Y., Kumamoto, Y., Yamada, M., Uchida, S. Pu isotopes in the seawater off Fukushima Daiichi Nuclear Power Plant site within two months after the severe nuclear accident, Environmental Pollution, Volume 246, March 2019, Pages 303-310


Wakiyama, Y., Onda, Y., Yoshimura, K., Igarashi, Y., Kato, H. Land use types control solid wash-off rate and entrainment coefficient of Fukushima-derived 137Cs, and their time dependence, Journal of Environmental Radioactivity Volume 210, December 2019, 105990

Physical Analysis

Yang, G., Hu, J., Tsukada, H., Tazoe, H., Shao, Y., Yamada, M. Vertical distribution of 129I and radiocesium in forest soil collected near the Fukushima Daiichi Nuclear Power Plant boundary, Environmental Pollution Volume 250, July 2019, Pages 578-585


Tsuji, H., Ishii, Y., Shin, M., Taniguchi, K., Arai, H., Kurihara, M., Yasutaka, T., Kuramoto, T., Nakanishi, T., Lee, S., Shinano, T., Onda, Y., Hayashi, S. Factors controlling dissolved 137Cs concentrations in east Japanese Rivers, Science of The Total Environment, Volume 697, 20 December 2019, 134093