reactor accident,nuclear 《英文msh詞典》Reactor Accident,Nuclear ; [入口詞] Reactor Accident,Nuclear ; [主題詞] Accidents,Radiation ; [英文釋義] Accidental dispersal of radioactive materials from a radiation source. Accidents at nuclear reactors can involve large groups of the population from dispersion of radioactivity into the environment and through fallout or a few individuals with high injurious doses.