Sources, effects and risks of ionizing radiation

This report assesses the levels and effects of exposure to ionizing radiation. The scientific annexes provide the supporting scientific rationale for UNSCEAR's 2019 report. Annex A focuses on evaluation of selected health effects and inference of risk due to radiation exposure described in five scenarios for risk evaluation: 1) leukemia after medical computed tomography scans during childhood; 2) leukemia after occupational radiation exposure; 3) solid cancer after occupational exposure; 4) thyroid cancer after exposure during childhood or adolescence; and 5) circulatory diseases after acute radiation exposure. Quantitative risk estimates are presented based on epidemiological studies and on the effects found among survivors of atomic bombings in Japan. Annex B focuses on the evaluation of lung cancer from exposure to radon.