氚，这种物质过往很少出现在人们视野，最近成为了网络高频词。这一元素究竟会对人体产生哪些影响?氚是1号元素氢的亲戚，又称超重氢，是一种放射性元素，因为不够稳定，会对外界释放能量和电子，这个过程被称为氚的衰变。
* NORM. Naturally occurring radioactive materials and Technologically Enhanced Naturally Occurring Radioactive Materials consist of materials， usually industrial wastes or by-products enriched with radioactive elements found in the environment， such as uranium， thorium and potassium and any of their decay products， such as radium and radon. For example， coal， a combustible black or brownish-black sedimentary rock， contains a substantial amount of the radioactive elements uranium and thorium. According to the UNSCEAR， the average specific activity of both uranium-238 and thorium-232 in coal is generally around 20 Bq/kg . Coal mines in Freital， Germany， which have uranium concentrations of 15000 Bq/kg， are an exception. Burning coal gasifies its organic materials， concentrating its inorganic components into the remaining waste， called fly ash. Around 10% of coal is fly ash. Fly ash is hazardous and toxic to human beings and some other living things， and fly ash also contains the radioactive elements uranium and thorium， which are concentrated by a factor of 10.
人是有主观能动性，而主观性便是人最大的特点。看到一则信息:4月5日，俄罗斯哈巴罗夫斯克市发现放射性污染源，当地事实紧急状态。4月9日，该市市长签署命令解除因发现放射性污染源【为一个工业探伤仪上的铯—137胶囊，目前转送至专业监管机构】紧急状态，该市生活秩序恢复正常。
