The positions of Chair(man) and (Scientific/Honorary) Secretary are complex. At the first meetings, the Chairman was selected by and from the International Congress of Radiology host country. The Secretary, selected from among the Commission members, had a leading role. Later, the Commission gained more control over selection of the Chairman, but until 1953, the position existed only during the International Congresses of Radiology. From the 1950 Rules: ‘. . . Chairman shall be a member of the I.C.R.P. ex officio, but for the period of the Conference only. Meetings between Congresses shall be presided over by the Secretary . . .’.
From 1953, the Chairman took on a more continuous role, with the Rules specifying that the Chairman serves continually. At that time, both the Chairman and Secretary were elected from among the members.
In 1962, F. David Sowby became the first full-time, paid Scientific Secretary. By 1966, the Rules specified that the Scientific Secretary need not be a member of the Commission, and that the Chairman, Vice-Chairman, and Scientific Secretary should work cooperatively to prepare meetings of the Commission.
In 1988, ICRP became a registered charity, with ICRP Main Commission members as its charity trustees. As trustees cannot be paid, from that time Scientific Secretaries have not been members of the ICRP Main Commission, but close cooperation between the Chair(men), Vice-Chair(men), and Scientific Secretaries has continued.
- From "The International Commission on Radiological Protection at 90" published in the Proceedings of the Fourth International Symposium on the System of Radiological Protection.
The tenures of ICRP Chairs have always aligned with the meeting or term dates shown below. The tenures of the (Scientific) Secretaries have not, and therefore dates are shown beside these names.
|Rolf M. Sievert||George W. C. Kaye & Stanley Melville (1928, 1931)|
|René Ledoux-Lebard||George W. C. Kaye (1934)|
|George W. C. Kaye||none specified|
|Sir Ernest Rock Carling||
Walter Binks (1950-1957)
|Rolf M Sievert||Bo Lindell (1957-1962)|
|Sir Edward Eric Pochin|
|C. Gordon Stewart||F. David Sowby (1962-1985)|
|Dan J. Beninson||Michael C Thorne (1985-1986)|
|Hylton Smith (1987-1997)|
|Roger H. Clarke|
|Jack Valentin (1997-2008)|
|Claire Cousins||Christopher H. Clement (from 2008)|