Abstract
The biological effects on humans of low-dose and low-dose-rate exposures to ionizing radiation have always been of major interest. The most recent concept as suggested by the International Commission on Radiological Protection (ICRP) is to extrapolate existing epidemiological data at high doses and dose rates down to low doses and low dose rates relevant to radiological protection, using the so-called dose and dose-rate effectiveness factor (DDREF). The present paper summarizes what was presented and discussed by experts from ICRP and Japan at a dedicated workshop on this topic held in May 2015 in Kyoto, Japan. This paper describes the historical development of the DDREF concept in light of emerging scientific evidence on dose and dose-rate effects, summarizes the conclusions recently drawn by a number of international organizations (e.g., BEIR VII, ICRP, SSK, UNSCEAR, and WHO), mentions current scientific efforts to obtain more data on low-dose and low-dose-rate effects at molecular, cellular, animal and human levels, and discusses future options that could be useful to improve and optimize the DDREF concept for the purpose of radiological protection.
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Acknowledgments
The present paper is based on presentations held at and discussions stimulated during a one-day workshop on DDREF jointly organized by ICRP and JANUS, on May 22, 2015, in Kyoto, Japan. RS and WR acknowledge the contribution of Dr. Linda Walsh (Bundesamt für Strahlenschutz, Germany) toward the planned meta-analysis of epidemiological studies. RERF, Hiroshima and Nagasaki, Japan, is a public interest foundation funded by the Japanese Ministry of Health, Labour and Welfare (MHLW) and the US Department of Energy (USDOE). RERF research is also funded in part through USDOE award DE-HS0000031 to the NAS. This publication is associated with RERF Research Protocol 1-75. The views of the authors do not necessarily reflect those of the two governments. The study at IES is performed under contract with the Aomori Prefectural Government, Japan.
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Rühm, W., Woloschak, G.E., Shore, R.E. et al. Dose and dose-rate effects of ionizing radiation: a discussion in the light of radiological protection. Radiat Environ Biophys 54, 379–401 (2015). https://doi.org/10.1007/s00411-015-0613-6
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DOI: https://doi.org/10.1007/s00411-015-0613-6