During the last I'cw years the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR)' has undertaken a broad review of the sources and effects of ionizing radiation. The results of this work have been issued in a series of publications: the UNSCEAR 1993 Report with nine scientific annexes. the UNSCEAR 1994 Keport with two scientific annexes and tile present UNSCEAK 1996 Iceport with one scicntific annex, "Effects of radiation on the environment". These three publications form a series of reports entitled Sources utid Effects oflotiizitlg Radiu~ion, which together inform the General Assenlbly and the scientific and world community of the Committee's latest findings and evaluations