INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTIONICRP ref: 4849-4461-1246

ICRP Committee 1 Meeting
November 18, 22-24, 2019 – Adelaide, Australia
The meeting was held at the Convention Center in Adelaide in conjunction to the ICRP symposium. Thecommittee began by observing a minute of silence for the memory of both Ranajit Chakraborty who died on
Sept 24, 2018 and Wolfgang Dörr who passed away suddenly on Oct 13, 2019. All C1 members will miss theirexpertise and friendship. Discussions during the C1 meeting and the joint-committee meetings covered a widerange of issues reflecting identified topics where refinements could drive ICRP future recommendations.
Working parties
Circulatory diseases: Based on the WP’s review of recent literature, C1 agreed that the terms of referenceof a potential new TG should be drafted. Several C1 members volunteered to help produce a first draft of theToR by the end of Q1 2020.
Non-radiation factors in detriment calculation: Several members will join the WP with a special focus toinvestigate alternative concepts to detriment. The WP will report their findings at the next C1 annual meeting.
Evaluation of recent risk models used for detriment calculation: Several C1 members agreed to join theWP to examine how risk models should be updated in light of the most recent findings mainly from the LSS.
This WP will report findings at the next C1 annual meeting in order to deliberate whether it should become aTG.
Hereditary and transgenerational effects: The WP is ready to propose the terms of reference of a TG to C1
and then to the ICRP scientific secretariat by the end of January 2020. The MC could be solicited for a postalballot before their meeting in May.
RBE and radiation weighting factors: This new WP will review ICRP Publication 92 and current literatureincluding new findings from animal data, in order to examine whether recent evidence could have major
implications for RBE and radiation weighting factors, which would inform the decision of whether to create anew TG.
Task Groups
TG 99 on Reference Animals and Plants (RAPs) Monographs proposed new definitions for RAP and DCRL
that were discussed between C1 and C4. The changes reflect the available underlying data at the level oftaxonomic class rather than family (i.e., mammals instead of rat or deer) and the meta-analysis method used
to derive DCRL. The plan is to circulate the report during Q1 2020, except for the “transfer” section which willcome later.
TG 111 on Factors Governing the Individual Response of Humans to Ionising Radiation kicked off lastDecember in Japan, in conjunction with an open ICRP-QST-RERF workshop in Tokyo. The workshop
summary will be published soon as a review paper in Radiation and Environmental Biophysics. The C1-C3
TG started a limited review of ca. hundred publications in English from 1989 to today, and agreed on evaluation
criteria. TG 111 will meet in Sept 2020 in Stockholm in conjunction with a 2-d workshop co-organised with theSwedish Academy of Sciences, on individual responses of normal tissue and cancer tissue to ionisingradiation. Several TG 111 members will give lectures during the workshop.
TG 115 on Risk and Dose Assessment for Radiological Protection of Astronauts kicked-off on November
20, 2019. The TG agreed on a first step focusing on lunar missions where various approaches will becompared on the basis of two example missions, in order to harmonise and evaluate the appropriateness ofdifferent risk metrics; a second step will be dedicated to deep space exploration missions and associatedradiological protection guidance.
The report from TG 64 on Cancer Risk for Alpha Emitters is ready for being approved by the MC for public
consultation during Q1 2020. The final version of the report from TG 102 on Detriment Calculation
Methodology is also nearly ready. TG-91 on Radiation Risk Inference at Low Dose and Low Dose Rate
Exposure for Radiological Protection Purposes is on the way to a draft version.
The next meeting of C1 is expected to take place in Stockholm, 31 August – 2nd September 2020.

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