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The field of nuclear semiotics arose in 1981 when a team of engineers, anthropologists, nuclear physicists, behavioral scientists and others was convened on behalf of the U.S. Department of Energy and Bechtel Corp. The goal of this "Human Interference Task Force" was to find a way to reduce the likelihood of future humans unintentionally intruding on radioactive waste isolation systems. Specifically, the task force was to research ways to prevent future access to the deep geological nuclear repository of Yucca Mountain. ==Problem== When atomic or fusion bombs are detonated in a war, or nuclear power plants are used in times of peace, an unnaturally high amount of radioactive waste is produced. This material will threaten human life and health for thousands of years. Consequently, nuclear technology necessitates the creation of a secure means of terminal storage for such materials for an unusually long time period. Unfortunately, there is no method available to continuously provide the necessary knowledge about the location of nuclear waste over thousands of years. The culture of earlier centuries becomes incomprehensible when it is not translated into new languages every few generations. National institutions do not exist longer than a few hundred years. Even religions are not older than a few millennia and do not typically hand down scientific knowledge. Furthermore, the necessary length of storage is disputed among specialists. One work group in Germany concluded that nuclear waste must be separated from the biosphere up to one million years – about 30,000 human generations. Earlier assumptions were based on a period of 10,000 years, which seems to be too short given the half-life of certain radioactive isotopes (e.g. Plutonium-239 at 24,000 years). The written historical tradition of humanity, in contrast, is only about 5000 years. Warnings in cuneiform script could be interpreted by some specialists, but others, such as the writing of the Indus Valley civilization, are already illegible after a few thousand years. 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「Human Interference Task Force」の詳細全文を読む スポンサード リンク
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