natural nuclear fission造句

• Later, other natural nuclear fission reactors were discovered in the region.
• There are, however, evidence of localized natural nuclear fission reactors see Oklo.
• Several natural nuclear fission reactors were discovered in the uranium mines in the region during 1972.
• The ability of natural geologic barriers to isolate radioactive waste is demonstrated by the natural nuclear fission reactors at Oklo, Gabon.
• The ability of natural geologic barriers to isolate radioactive waste is demonstrated by the natural nuclear fission reactors at Oklo, Africa.
• The transuranic elements from americium to fermium occurred naturally in the natural nuclear fission reactor at Oklo, but no longer do so.
• In two regions of Oklo, Gabon, Africa, natural nuclear fission reactors were active over 1.5 billion years ago.
• The Oklo natural nuclear fission reactor contains evidence that significant amounts of technetium-99 were produced and have since decayed into ruthenium-99.
• It has also been formed more recently in the Natural nuclear fission reactor of Gabon, though again, has almost completely decayed by now.
• Any attempts to explain the paradox must therefore factor in both radiogenic contributions, both from decay heat and from any potential natural nuclear fission reactors.
• The transuranic elements from americium to fermium, including berkelium, occurred naturally in the natural nuclear fission reactor at Oklo, but no longer do so.
• The transuranic elements from americium to fermium, including curium, occurred naturally in the natural nuclear fission reactor at Oklo, but no longer do so.
• The transuranic elements from americium to fermium, including californium, occurred naturally in the natural nuclear fission reactor at Oklo, but no longer do so.
• Earth formed, followed by its slow decay, accounts for why a Natural nuclear fission reactor was possible in the past, but cannot happen now.
• Besides naturally occuring deposits Natural nuclear fission reactor of radioactive material have been found which at one time had critical mass and were shielded only by overlayment and groundwater.
• In rare occasions, earlier in geologic history when uranium-235 was more abundant, uranium ore was found to have naturally engaged in fission, forming natural nuclear fission reactors.
• :: : About 2 billion years ago, some plutonium was naturally created on Earth; see natural nuclear fission reactor .-- Robert Merkel 09 : 21, 1 July 2006 ( UTC)
• Also, check out Natural nuclear fission reactor about a prehistoric natural reactor in Gabon about 2 billion years ago, which was similar to your question . talk ) 20 : 24, 6 January 2016 ( UTC)
• As an example, 1.7 billion years ago the NA of 235 U was 3.1 % compared to today's 0.7 %, and for that reason a natural nuclear fission reactor was able to form, something that cannot happen today.
• There is strong geochemical evidence that the Oklo uranium deposit behaved as a natural nuclear fission reactor in Precambrian times : some of the mined uranium was found to have a lower concentration of uranium-235 than expected, as if it had already been in a reactor.