Centers & Labs

RIKEN Nishina Center for Accelerator-Based Science

Safety Management Group

Group Director: Kanenobu Tanaka (D.Sci.)
Kanenobu  Tanaka(D.Sci.)

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

Mathematical and physical sciences

Related Research Fields



  • Nuclear physics
  • Accelerator
  • Radiation shield
  • Radiation measurement
  • Radiation protection

Selected Publications

  1. Nakao, N., Uwamino, Y., Tanaka, K., :
    “Measurement of the neutron angular distribution from a beryllium target bombarded with a 345-MeV/u 238U beam at the RIKEN RI beam factory”
    Nuclear Instruments and Methods B, B423, 27-36 (2018)
  2. 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)
  3. 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)
  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

Kanenobu Tanaka
Group Director

Core Members

Hisao Sakamoto
Nishina Center Technical Scientist
Rieko Higurashi
Nishina Center Technical Scientist
Atsuko Akashio
Technical Staff I
Tomoyuki Dantsuka
Technical Staff I

Contact information

Nishina Bldg,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: ktanaka [at]