Detection of Plutonium-244 in Nature

  title={Detection of Plutonium-244 in Nature},
  author={Darleane C. Hoffman and F. O. Lawrence and Jack L Mewherter and Frank Rourke},
Mass spectrometric measurements of plutonium isolated from Precambrian bastnasite confirm the presence of 244Pu in nature. Although the existence of 244Pu as an extinct radioactivity has been postulated to explain the xenon isotope ratios observed in meteorites, this is the first indication of its present existence in nature. 
Haloes from plutonium minerals and fission alphas?
The normal alpha decay of naturally occurring 244Pu can be expected to have produced pleochroic haloes detectable in existing rocks. Several methods of identifying such haloes are described here.
Plutonium anomaly in nature.
The 239Pu/238U ratios are reexamined in volcanic ashes and rock, uranium mineral and other contemporary terrestrial samples and also in the atmospheric samples. This ratio in rain samples collected
Possible cosmic dust origin of terrestrial plutonium-244
THE discovery of 244Pu by Hoffman et al.1 in bastnaesite, a Precambrian rare earth fluorocarbonate ore from the Mountain Pass deposit in California, has raised the question of whether the so-called
Xenology, FUN Anomalies and the Plutonium-244 Story
It has long been generally accepted that 244Pu fission xenon is absent in lunar fines, while carbonaceous chondrites contain the so-called xenon-HL, which is a strange fission-like xenon component,
Isotopic Composition of Lead in Galena from the Mountain Pass Carbonatite, California
LITTLE is known of the isotopic composition of lead in carbonatites, a rock type commonly considered to be derived from the mantle. Here I shall present data for galena from the Mountain Pass
A Study on Determination of Potentially Hazardous Plutonium Isotopes in Environmental Samples
  • D. Strumińska-Parulska
  • Environmental Science
    Journal of environmental science and health. Part C, Environmental carcinogenesis & ecotoxicology reviews
  • 2013
The concentrations of plutonium isotopes in analyzed samples indicates its measurement is of great importance for environmental and safety assessment, especially in contaminated areas.
Section 4. Radiogenic Argon and Xenon in the Mantle and the ‘Age’ of Mantle Degassing
Similar to the case of He discussed in the last section, terrestrial Ar is dominated by its radiogenic isotope 40Ar, produced by the radioactive decay of 40K[23][1]. Indeed 40Ar forms a significant
A Search for Natural Pu-244 in Deep-Sea Sediment: Progress Report
“Now-extant” Pu-244 discovered in a Precambrian bastnaesite by D.C. Hoffman et al. in 1971 was explained by one of the authors (K.S.) in 1974 as due to possible inflow to the Earth as a cosmic dust


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.
Simultaneous determinations of U and Th abundances are obtained in the Orgueil (type I) carbonaceous chondrite, the Mokoia and Karoonda olivine-pigeonite chondrites, and the Hvittis enstatite
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
A Three Stage Mass Spectrometer
A three stage mass spectrometer, utilizing two consecutive magnetic focusing lenses of 20″ radii followed by a 20” radius of curvature electrostatic analyzer, is described An abundance sensitivity of
The abundance of244Pu in the early solar system