Proceedings of an international conference, Paris, 24-28 October 1994. Upon a request by the IAEA, the Swedish Risk Academy commissioned a set of background papers on issues relating to the comprehension of radiation risk to serve as a scientific input for the conference. The papers cover topics of importance for risk assessment and for comprehending and communicating on radiation risk. Contents: (Vol. 2) Background papers prepared for the conference by IPSN; Poster presentations: Assessment of radiation exposure levels; Assessment of radiation health effects; Impact of radiation on the environment; Perception of radiation risk; Managing radiation risk; The nuclear weapons legacy; Cancer and leukaemia clusters; Radon in homes; Radioactive waste disposal and the environment; Chernobyl health effects.