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Werner RÜHM CHAIR OF INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION (ICRP) Bio Werner Rühm leads the Medical and Environmental Dosimetry Group at the Helmholtz Center Munich, Institute of Radiation Medicine, Germany. In addition, he is professor at the Medical Faculty of the University of Munich. Dr. Rühm has been a member of Committee 1 (C1) of the International Commission on Radiological Protection (ICRP) since 2005. He served as C1 Secretary from 2012 to 2016 and was C1 Chair from 2016 until 2021. From 2014 to 2020, he was Chair of the European Radiation Dosimetry Group (EURADOS). In 2020 he was elected Chair of the German Radiation Protection Commission (SSK) and - by the German Federal Parliament and the Federal Council of Germany - as a member of the National Civil Society Board. In 2021 he was elected Chair of ICRP. Werner Rühm has published on various topics including quantification of neutron exposure of atomic-bomb survivors, cosmic-ray exposure of air crew, the role of neutrons in risk assessment of atomic-bomb survivors, risks from low dose and low-dose-rate exposures, behaviour of radionuclides in the environment, internal exposures from incorporated radionuclides, and radiation measurement techniques. THE COMMISSION ICRP is a non-profit, non-governmental entity, formally a charity, that promotes the science of radiological protection by providing recommendations on protec- tion against ionising radiation. It brings together a community of more than 300 experts from more than 40 countries. The Commission issues international reference documents, on which various specialised committees work. Why do we need to revise the current ICRP system of Radiological Protec- tion? What are the problems and gaps in the current system? First of all, it is important to emphasise that the current System of Radiological Protection is robust and is working well. It has evolved over many decades and is being applied all over the world wher- ever radiological protection is needed to guarantee the safe use of ionising radiation. Nevertheless, we see a fast development of science and technology leading to an improved understanding of radiation-induced biological effects on the one hand, and an enhanced use of technical solutions including medical applications of ionising radiation on the other hand. Such developments require a continuous and thorough evaluation of any potential implications for radiological protection. This is why ICRP has recently embarked on a review of the current Sys- tem of Radiological Protection. Faced with the challenge of revising the System of Radiological Protection, what are the priority areas currently addressed by the ICRP? As a first step, the ICRP Main Commis- sion assessed the current System of Radiological Protection, consulting with a number of other international organisa- tions in the field, and set out initial reflec- tions on the core elements that may require attention (Clement et al. 2021). RADIOPROTECCIÓN • No 103 • Abril 2022 5