United Nations Scientific Committee on the Effects of Atomic Radiation; scientific committee of the General Assembly of the United Nations on the effects of ionizing radiation. UNSCEAR regularly prepares reports for the UN General Assembly on radiation exposure and the effects of ionizing radiation. The latest publication is the UNSCEAR 2010 Report: “Summary of low-dose radiation effects on health”. The penultimate publication was the UNSCEAR 2008 Report: “Sources and effects of ionizing radiation”.