The Oklo Phenomenon

Kuroda, P. Κ.

doi:10.1007/978-3-642-68667-2_4

Cited by 9 publications

(6 citation statements)

References 44 publications

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“…[11] and Ref. [35]); •: Oklo samples reported by Kuroda [36]; Δ: Other terrestrial samples reported by Kuroda [36]. and in the previous report [11].…”

Section: Plutonium-244 Ages Of the Carbonaceous Chondrites Murchisonmentioning

confidence: 90%

“…Most of the xenon was found in the residue CE, which contained 248.000X10" 12 (cm 3 STP/g) of 136 Xe, or 6.75X10" 12 (cm 3 STP/0.0272 mg residue). Table 5 shows that 17.6% of the , 36 Xe found in this sample was 244 Pu fission xenon and hence the amount of 136f Xe found in this 0.0272-mg sample of residue CE was (6.75X10" 12 ) (0.176) = 1.188X10" 12 …”

Section: Plutonium-244 Fission Xenon In the Carbonaceous Chondrites Mmentioning

confidence: 97%

“…1 of Kuroda and Myers [35] and 9 data points for the 136f Xe/U ratios for terrestrial rock samples taken from Fig. 1 of Kuroda [36] are also plotted here for comparison. Most of the data points for the terrestrial rock samples lie below the curve representing the calculated amounts of ,36f Xe produced by the spontaneous fission of 235 U.…”

Section: Plutonium-244 Ages Of the Carbonaceous Chondrites Murchisonmentioning

confidence: 99%

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Plutonium-244 Fission Xenon in the Most Primitive Meteorites

Kuroda¹,

Myers²

1994

Radiochimica Acta

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The plutonium-244/xenon-136 ages of the Murchison, Murray and Orgueil meteorites have been calculated from the existing xenon isotope data and the uranium contents. The CI carbonaceous chondrite Orgueil, which is considered to be among the most primitive -in the sense of the least altered -sample of the solar system known to man, appears to have started to retain its xenon more than 5,000 million years ago, when the ratio of ^"Pu to 238 U in the solar system was as high as (0.5 ±0.1) (atom/atom) and the CM carbonaceous chondrites Murchison and Murray started to retain their xenon about 4,940 million years ago, when the 244 Pu to 238 U ratio was about 0.17 (atom/ atom).

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“…[11] and Ref. [35]); •: Oklo samples reported by Kuroda [36]; Δ: Other terrestrial samples reported by Kuroda [36]. and in the previous report [11].…”

Section: Plutonium-244 Ages Of the Carbonaceous Chondrites Murchisonmentioning

confidence: 90%

Section: Plutonium-244 Fission Xenon In the Carbonaceous Chondrites Mmentioning

confidence: 97%

Section: Plutonium-244 Ages Of the Carbonaceous Chondrites Murchisonmentioning

confidence: 99%

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Plutonium-244 Fission Xenon in the Most Primitive Meteorites

Kuroda¹,

Myers²

1994

Radiochimica Acta

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“…The recent findingsconfirmthe basic misunderstanding of nuclear energy that Kuroda noted in his 1936 class-notes followingAston"s lecture at the Imperial University of Tokyo (Kuroda, 1992) and the validity of Kuroda"s insight into the beginning of the world, while standing in the ruins of Hiroshima one day in August 1945: "The sight before myeyes was just like the end of the world, but I also felt that the beginning of the world may have been just like this" (Kuroda, 1982, page 2).Richard Carrington (1859) had already reported the immediate effects on Earth from a large solar flare, Hess had received a Nobel Prize for discovering cosmic rays (Hess, 1936), and Forbush (1937Forbush ( , 1938 had reported impulsive decreases in cosmic ray intensity from solar-induced geomagnetic storms.…”

Section: Int J Adv Res 4(10) 929-933mentioning

confidence: 99%

Solar Cosmic Rays and Climate.

Manuel.¹,

Hwaung²

2016

IJAR

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“…2, in particular, for the natural REE of sample A sup port the scenario presented by Maurett (1976) (cf. the review by Kuroda (1983)).…”

Section: Mass Spectrometric Measurementmentioning

confidence: 99%

Abundance of fissiongenic and pre-reactor natural rare-earth elements in a uranium ore sample from Oklo.

et al. 1988

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The behavior of rare-earth elements (REE) in the Oklo natural nuclear reactors was studied. Isotopic ratios of all REE in the Oklo uranium ore samples were measured with a thermal ionization mass spectrometer, and the REE abundances were determined by the stable isotope dilution method. On the basis of these data, the behavior of REE in the process of formation of ore body and during and/or after the operation of the natural nuclear reactor was investigated. The total amount for each of the REE is allotted to natural and fissiongenic fractions by a calculation based on the nuclear data. The pat tern for pre-reactor natural REE explicitly endorses the participation of water in formation of this ore deposit. Meanwhile, a fission yield curve involving Nd, Sm and Gd is found to be generally smooth. But deviations in La and Ce, and shifts among the fissiongenic segments for Nd, Sm and Gd are observed. These features can be accounted for as reflecting the systematic differential partial loss of fissiongenic light REE. The partial loss of progenitors of 140Ce and 142Ce is found to be unlikely.

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The Oklo Phenomenon

Cited by 9 publications

References 44 publications

Plutonium-244 Fission Xenon in the Most Primitive Meteorites

Plutonium-244 Fission Xenon in the Most Primitive Meteorites

Solar Cosmic Rays and Climate.

Abundance of fissiongenic and pre-reactor natural rare-earth elements in a uranium ore sample from Oklo.

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