The Xenon Record of Extinct Radioactivities in the Earth

  title={The Xenon Record of Extinct Radioactivities in the Earth},
  author={Mervet S. Boulos and Oliver K. Manuel},
  pages={1334 - 1336}
Analyses of xenon from well gas rich in carbon dioxide reveal a large excess of radiogenic xenon-129 from the decay of extinct iodine-129. Smaller excesses observed in the heavy xenon isotopes are from fission. These results place narrow limits on any age difference between the earth and the oldest meteorites. The occurrence of excess radiogenic xenon-129 in well gas also suggests that any quantitative degassing of existing solid materials to form the atmosphere must have been limited to a very… 
Noble gases in an Hawaiian xenolith
THE noble gas record in meteorites and lunar samples has been the subject of many investigations aimed at determining their age, the history of their exposure to cosmic rays and to the solar wind,
IT has been established from isotope studies of zenon in meteorites that two radioactive nuclides that are now extinct once existed in the solar system. In 1960 Reynolds1 discovered radiogenic 129Xe,
Xenon decay products of extinct radionuclides in the Navajo, New Mexico well gas.
The isotopic composition of xenon has been determined in samples of the Navajo C-1 well gas, Wildcat Field, New Mexico. Our results indicate that xenon in the Navajo well gas contains radiogenic
Terrestrial xenon isotope constraints on the early history of the Earth
Comparison between 129I-radiogenic 129Xe and 244Pu-fissiogenic 136Xe components in terrestrial xenon suggests that the Earth's inner region accreted a few tens of millions of years earlier than the
Xenon's Inside Story
Isotopes of the noble gas xenon are generated in the earth by the decay of other radioactive elements. How the different isotopes are distributed is an important clue to the puzzle of how the early
Noble gases in the earth's mantle
Abstract The abundances and isotopic compositions of noble gases in two samples from ultramafic xenoliths in alkali basalt, a young kaersutitic amphibole separated from a peridotite xenolith from
Isotopic Composition of Terrestrial Atmospheric Xenon and the Chain Reaction of Fission
From the comparison of terrestrial atmospheric Xe with the primordial Xe (solar, AVCC), a strange component with a fine structure at 132Xe and 131Xe have been found. It was shown that the isotopic
Josephinite: A terrestrial alloy with radiogenic xenon-129 and the noble gas imprint of iron meteorites
Analyses of noble gases released by stepwise heating of Josephinite reveal two radiogenic components, radiogenic 129Xe≈ 1 × 10-12ccSTP/g and radiogenic 40Ar≈1×10-6ccSTP/g, and the following
Xenon in CO2 well gas revisited
We have analyzed the rare gases in a CO2 well gas from Harding County, New Mexico, by mass spectrometry. We have reconfirmed the monoisotopic excess of 129Xe measured previously. The excesses of
New evidence for chemical fractionation of radioactive xenon precursors in fission chains.
Mass-spectrometric analyses of Xe released from acid-treated U ore reveal that apparent Xe fission yields significantly deviate from the normal values, and chemically fractionated fission (CFF), previously observed only in materials experienced neutron bursts, is likely responsible for the isotopic difference in Xe in the Earth's and Martian atmospheres.


Plutonium-244: Confirmation as an Extinct Radioactivity
The mass spectrum of xenon from spontaneous fission in a laboratory sample of plutonium-244 is precisely what meteoriticists predicted it would be, and the search for an explanation for anomalous fission-like xenon in carbonaceous chondrites can now be narrowed.
Unambiguous evidence for fission-produced nuclides in meteorites has been shown in the abundance pattern of the Xe isotopes from the Pasamonte meteorite. Calculation of the age of the meteorite from
Nuclear Fission in the Early History of the Earth
Differences in the isotopic ratios of xenon in the Earth's atmosphere and in the Richardson meteorite are discussed. The differences indicate that at least 10% of the atmospheric xenon-138 is
Isotopic variations in terrestrial xenon
Isotopic composition and amounts of xenon extracted from eclogite, from old granite, and from CO_2-well gases have been measured. The Xe content of Bavarian eclogite is close to that of the earth
Correlation Between Fission Tracks and Fission-Type Xenon from an Extinct Radioactivity
Meteoritic whitlockite containing excess fission tracks has a large concentration of excess neutron-rich xenon isotopes which is 25 times that calculated from the track density. The isotopic spectrum
The terrestrial economy of helium and argon
Abstract Using a model of continuous degassing of the earth and recent data on the chemical composition of chondritic meteorites, a “degassing constant,” α, is determined from the argon-40 economy of
Xenon in natural gases
Abstract Analyses of noble gases from four natural gases reveal radiogenic He4 and Ar40, excess Ne21 and Ar38 from α-induced reactions and an excess of the β-unshielded xenon isotopes with an
Solar Wind Gases, Cosmic Ray Spallation Products, and the Irradiation History
Varying relative production rates of the krypton and xenon isotopes in these rocks suggest different irradiation conditions and a complex history for at least some of the rocks.
Iodine and uranium in ultrabasic rocks and carbonatites
Abstract A series of ultrabasic rocks and carbonatites were analyzed by neutron activation for iodine and uranium. The uranium data are compared with earlier data on the uranium content of possible
Iodine-129 in Terrestrial Ores
Xenon extracted from natural iodyrite (silver iodide) from Broken Hill, New South Wales, Australia, contains excess xenon-129 from the in situ decay of naturally occurring iodine-129 and excess