Radioactive waste

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  • radioactive waste
definition
  • Any waste that emit radiation in excess of normal background level, including the toxic by-products of the nuclear energy industry.
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Abstract from DBPedia
    Radioactive waste is a type of hazardous waste that contains radioactive material. Radioactive waste is a result of many activities, including nuclear medicine, nuclear research, nuclear power generation, rare-earth mining, and nuclear weapons reprocessing. The storage and disposal of radioactive waste is regulated by government agencies in order to protect human health and the environment. It is broadly classified into low-level waste (LLW), such as paper, rags, tools, clothing, which contain small amounts of mostly short-lived radioactivity, intermediate-level waste (ILW), which contains higher amounts of radioactivity and requires some shielding, and high-level waste (HLW), which is highly radioactive and hot due to decay heat, so requires cooling and shielding. In nuclear reprocessing plants about 96% of spent nuclear fuel is recycled back into uranium-based and mixed-oxide (MOX) fuels. The residual 4% is fission products which are highly radioactive High-Level Waste. This radioactivity naturally decreases over time, so the material is stored in appropriate disposal facilities for a sufficient period until it no longer poses a threat. The time radioactive waste must be stored for depends on the type of waste and radioactive isotopes. Short-term approaches to radioactive waste storage have been segregation and storage on the surface or near-surface. Burial in a deep geological repository is a favored solution for long-term storage of high-level waste, while re-use and transmutation are favored solutions for reducing the HLW inventory. A summary of the amounts of radioactive waste and management approaches for most developed countries are presented and reviewed periodically as part of the International Atomic Energy Agency (IAEA)'s Joint Convention on the Safety of Spent Fuel Management and on the Safety of Radioactive Waste Management.

    放射性廃棄物(ほうしゃせいはいきぶつ、英: radioactive waste)とは、使用済みの放射性物質及び放射性物質で汚染されたもので、以後の使用の予定が無く廃棄されるものを言う。 原子力発電に代表される原子力エネルギーの利用に伴って発生し、また医療や農業、工業における放射性同位元素(RI)の利用によっても発生する。日本においては、その発生源に応じて取り扱いを規定する法律及び所管官庁が異なる。

    (Source: http://dbpedia.org/resource/Radioactive_waste)