Isotope - Wikipedia, the free encyclopedia
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A nuclide is an atomic nucleus with a specified composition of protons and neutrons. The nuclide concept emphasizes nuclear properties over chemical properties while the isotope concept does the...
en.wikipedia.org/wiki/Isotope
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Radioactive decay - Wikipedia, the free encyclopedia
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Radioactive decay is the process in which an unstable atomic nucleus spontaneously loses energy by emitting ionizing particles and radiation. This decay, or loss of energy, results in an atom of one ...
en.wikipedia.org/wiki/Radioactive_decay
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It is evident that these responsibilities are taken very seriously in OECD countries in the late 20th century. ... In any case, the efficiency of the nuclear transmutation process would not be sufficient to eliminate all long-lived radioactive wastes and thereby avoid the need for a long-term isolation strategy [6].
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www.nea.fr/html/rwm/reports/1995/geodisp-entire-report....
www.nea.fr/html/rwm/reports/1995/geodisp-entire-report.html
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As a result, the inventory of the radioactive products contained in irradiated fuel is not fixed for ever: ... we can make use of nuclear reactions that will transmute the very long-lived wastes into less radioactive or shorter-lived products. ... Depending on the proportion of the U238 isotope in the core, a fast reactor...
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www.nea.fr/html/trw/intro/ens.html
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IAEA-TECDOC-1357; Management of disused long lived sealed radioactive sources (LLSRS); June 2003; ... ∗ 137Cs and 90Co do not belong to the category of LLSRS by definition. However, since the risk associated with these high activity sources in long term is compared with less active long lived sources,
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www-pub.iaea.org/MTCD/publications/PDF/te_1357_web.pdf
www-pub.iaea.org/MTCD/publications/PDF/te_1357_web.pdf
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Cesium-135 is a very long lived radioactive isotope. It has a half-life of 2.3 million years. Half-life is ... However to a first approximation, considering that long lived nuclei will mostly decay outside of the reactor, where it will not be subject to transmutation, ... One would not have this much immediately, but would take...
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www.dailykos.com/story/2007/1/29/11518/4012
www.dailykos.com/story/2007/1/29/11518/4012
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For instance, if you have a sample of a long-lived radioactive isotope and you see on average 4 decays per minute, during any given minute the probability of seeing k decays is given by the formula above. ... Pi isn’t random. No one who understands what “random” means would say that. In fact, pi is very much not random.
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It is possible to make a fundamental determination of the age of a star that is quite independent of stellar evolution models, provided it contains a suitable long-lived radioactive isotope [3]. The use of a "radioactive ... For the method to work well, the right choice of radioactive isotope is very critical.
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www.eso.org/outreach/press-rel/pr-2001/pr-02-01.html
www.eso.org/outreach/press-rel/pr-2001/pr-02-01.html
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If the abundance of the long-lived isotopes uranium (U235 and U238), potassium (K40), and thorium (Th232) were similar in the earth ... Far from providing evidence for an earth that is billions of year old, radioactive isotope distributions within the earth may show the earth's formation could not have been very long ago!
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www.sentex.net/~tcc/radearth.html
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