Ritsu Sakata


Department of Epidemiology
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Dr. Sakata is conducting estimation of radiation effects among atomic-bomb survivors, especially she was in charge of a mail survey that asked about lifestyle factors of the subjects and is attempting to estimate radiation effects more appropriately using the information that have been cumulated in the ABCC-RERF during the long-term study period but has not been used. She is in charge of supervising the section that is collecting follow-up information from a scientific viewpoint and providing supports and suggestions to the inside/outside collaborators who use the data of RERF.


M.S. (Biostatistics) Biostatistics center, Kurume University, Fukuoka, Japan
Ph.D. (Epidemiology) Kurume University School of Medicine, Fukuoka, Japan
M.S. (Pharmaceutical Sc.) Pharmaceutical Sc., Kyushu University, Fukuoka, Japan
B.A. (Pharmaceutical Sc.) Daiichi University of Pharmacy, Fukuoka, Japan


Radiation Effects Research Foundation, Department of Epidemiology
  • 2022-

    Acting Department Chief

  • 2017-

    Assistant Chief

  • 2016-2017

    Senior Scientist

  • 2012-2016

    Associate Senior Scientist

  • 2006-2012

    Research Scientist

Kurume University School of Medicine
  • 1993-2006

    Assistant professor, Department of Public Health, Kurume University School of Medicine

Selected publications

Fujihara M, Sakata R, Yoshida N, Ozasa K, Preston DL, Mabuchi K. Incidence of lymphoid neoplasms among atomic bomb survivors by histological subtype: 1950-1994. Blood. 2021/08/26 [Epub]:1-27.
Sakata R, Preston DL, Brenner AV, Sugiyama H, Grant EJ, Rajaraman P, Sadakane A, Utada M, French B, Cahoon EK, Mabuchi K, Ozasa K. Radiation-related risk of cancers of the upper digestive tract among Japanese atomic bomb survivors. Radiat Res. 2019; 192(3):331-44.
Sakata R, Grant EJ, Furukawa K, Misumi M, Cullings HM, Ozasa K, Shore RE. Long-term effects of the rain exposure shortly after the atomic bombings in Hiroshima and Nagasaki. Radiat Res. 2014; 182:599-606.
Sakata R, McGale P, Grant EJ, Ozasa K, Peto R, Darby SC. Impact of smoking on overall mortality and life expectancy in Japanese smokers: A prospective cohort study. BMJ. 2012/10/25;345(e7093):12 p.
Sakata R, Kleinerman RA, Mabuchi K, Stovall M, Smith SA, Weathers R, Wactawski-Wende J, Cookfair DL, Boice JD, Jr., Inskip PD. Cancer mortality following radiotherapy for benign gynecologic disorders. Radiat Res. 2012;178(3):266-79.
Sakata R, Shimizu Y, Soda M, Yamada M, Hsu WL, Hayashi M, Ozasa K. Effect of radiation on age at menopause among atomic bomb survivors. Radiat Res. 2011;176(6):787-95.