 In response to this, the Commission decided on new rules in order to establish full control over its future membership.After World War II the increased range and quantity of radioactive substances being handled as a result of military and civil nuclear programmes led to large additional groups of occupational workers and the public being potentially exposed to harmful levels of ionising radiation.Against this background, the first post-war ICR convened in London in 1950, but only two IXRPC members had survived the war; Lauriston Taylor and Rolf Sievert.