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通常称之为放射性,存在于所有的物质之中,这是亿万年来存在的客观事实,是正常现象。核辐射是原子核从一种结构或一种能量状态转变为另一种结构或另一种能量状态过程中所释放出来的微观粒子流。人们在长期的实践和应用中发现,少量的辐射照射不会危及人类的健康,对日常不接触辐射性工作的人来说,每年正常的天然辐射为1000～2000微西弗。
Often referred to as radioactivity, which is present in all matter, this is an objective fact that exists for billions of years and is a normal phenomenon. Nuclear radiation is the flow of microscopic particles released by a nucleus from one structure or one energy state to another or from another energy state. People in the long-term practice and application found that a small amount of radiation exposure will not endanger the health of human beings, for people who do not routinely work with radiation, annual normal natural radiation of 1000 to 2000 microsievert.