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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Low-level radioactive waste policy of the United States ： ウィキペディア英語版 Low-level radioactive waste policy of the United States Radioactive waste is generated from the nuclear weapons program, commercial nuclear power, medical applications, and corporate and university-based research programs. Some of the materials LLW consists of are: "gloves and other protective clothing, glass and plastic laboratory supplies, machine parts and tools, and disposable medical items that have come in contact with radioactive materials".〔 Waste is generally categorized as high level waste (HLW) and low-level waste (LLW). LLW contains materials such as irradiated tools, lab clothing, ion exchanger resins, animal carcasses, and trash from defense, commercial nuclear power, medical, and research activities.〔 These materials usually have radioactivity that have short half lives—from ranges of multiple days to several hundred years. In 1990, 1.1 million cubic feet of LLW was produced.〔 Currently, U.S. reactors generate about 40,000 cubic meters of low-level radioactive waste per year, including contaminated components and materials resulting from reactor decommissioning. ==Classes of low level waste== The U.S. Nuclear Regulatory Commission (NRC) has LLW broken into three different classes: A, B, and C. These classes are based on the wastes' concentration, half-life, as well as what types of radionuclides it contains.〔(【引用サイトリンク】title=Low-level Radioactive Waste )〕 Class A consists of radionuclides with the shortest half-life and lowest concentrations. This class makes up 95% of LLW and its radioactivity levels return to background levels within 100 years.〔 Classes B and C contain greater concentrations of radionuclides with longer half-lives, fading to background levels in less than 500 years. They must meet stricter disposal requirements than Class A waste. Any LLW that exceeds the requirements for class C waste is known as “Greater Than Class C”; this material makes up less than 1 percent of all LLW and is the responsibility of the United States Department of Energy under federal law.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Low-level radioactive waste policy of the United States」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.