natural nuclear fission reactor造句

• Later, other natural nuclear fission reactors were discovered in the region.
• 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.
• It is interesting to note that in Africa at Oklo where the natural nuclear fission reactor operated millions of years ago the isotopic mixture of neodymium is not the same as'normal'neodymium, it has an isotope pattern very similar to the neodymium formed by fission.