Centers & Labs

RIKEN Nishina Center for Accelerator-Based Science

Safety Management Group

Group Director: Yoshitomo Uwamino (D.Eng.)
Yoshitomo  Uwamino(D.Eng.)

The Nishina Center for Accelerator-Based Science possesses one of the biggest heavy-ion accelerator facilities in the world which consists of two heavy-ion linear accelerators and 5 cyclotrons. Uranium ions are accelerated here only in Japan. Electron accelerators of microtron and synchrotron-storage-ring are also operated. Our function is to keep the radiation level in and around the facility below the allowable limit and to control the exposure on the workers as low as reasonably achievable. We are also involved in the safety management of the Radioisotope Center where many types of experiments are performed with sealed and unsealed radioisotopes.

Main Research Field


Related Research Fields

Interdisciplinary science and engineering


  • Health Physics
  • Accelerator
  • Radiation Shielding
  • Radiation Detection

Selected Publications

  1. Akashio, A., Tanaka, K., Imao, H., and Uwamino Y.:
    "Activation measurement by 238U beam irradiation around 11A MeV on He gas"
    13th International Conference on Radiation Shielding & 19th Topical Meeting of the Radiation Protection & Shielding Division of the Ameriacn Nuclear Society 2016 (ICRS13-RPSD2016), Paris, France, October (2016)
  2. Tanaka, K., Inabe, N., Yoshida, K. and Kubo, T.:
    "Evaluation of radiation levels and comparison with PHITS calculation for the BigRIPS separator in Radioactive Isotope Beam Factory"
    Progress in Nuclear Science and Technology, 4, 201-204 (2014)
  3. Nakao, N., Uwamino, Y. and Tanaka, K.:
    "Measurement of neutrons generated by 345 MeV/u U-238 beam at RIKEN RIBF"
    Proceedings of the 5th International Particle Accelerator Conference (IPAC2014), Dresden, 1811-1913 (2014)
  4. Tanaka, K., Inabe, N., Yoshida, K., Kusaka, K. and Kubo, T.:
    "Pillow seal system at the BigRIPS separator"
    Nuclear Instruments and Methods B, B317, 734-738 (2013)
  5. Uwamino, Y., Sakamoto, H., Higurashi-Hirunuma, R., Mukai, H., Fukuda, H. and Akashio, A.:
    "A state of the RIKEN Radioisotope Beam Factory"
    Indian Journal of Pure and Applied Physics, 50, 442-445 (2012)
  6. Matsumura, H., Saito, K., Ishioka, J. and Uwamino, Y.:
    "Diffusion of radioactive materials from Fukushima Daiichi Nuclear Power Station obtained by gamma-ray measurements on expressways"
    Transactions of the Atomic Energy Society of Japan, 10, 152-162 (2011) (in Japanese)

Lab Members

Principal Investigator

Yoshitomo Uwamino
Group Director

Core Members

Kanenobu Tanaka
Deputy Group Director, Safety Management Group
Hisao Sakamoto
Nishina Center Technical Scientist
Rieko Higurashi
Nishina Center Technical Scientist
Atsuko Akashio
Technical Staff I
Tomoyuki Dantsuka
Technical Staff I

Contact information

202 Nishina Building,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Tel: +81-(0)48-462-6499
Fax: +81-(0)48-461-5301

Email: uwamino [at]

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