Identifying large chondrites using cosmogenic radionuclides

K. C. Welten, M. W. Caffee, D. J. Hillegonds, J. Masarik, K. Nishiizumi

Research output: Contribution to journal › Article

4 Citations (Scopus)

Abstract

We measured the concentrations of the cosmogenic radionuclides 10Be, 26Al, 36Cl and 41Ca in the metal and stone fractions of three large chondrite showers to determine their pre-atmospheric size. Large chondrites are characterized by substantial contributions of neutron-capture 41Ca in the stone fraction (up to ∼2 dpm/gCa), low radionuclide concentrations in the metal fraction and high 10Be(stone)/10Be(metal) ratios. Based on the measured concentrations in comparison with calculated cosmogenic nuclide depth profiles, using a semi-empirical and a purely physical model, we conclude that these objects had pre-atmospheric radii ranging from ∼80 cm to >3 m. We conclude that the semi-empirical model is more reliable for spallogenic production rates in large objects, while the purely physical model is more reliable for neutron-capture products.

Original languageEnglish (US)
Pages (from-to)1185-1188
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume268
Issue number7-8
DOIs
StatePublished - Apr 2010
Externally publishedYes

Fingerprint

chondrites
Radioisotopes
radioactive isotopes
rocks
Neutrons
Metals
metals
neutrons
nuclides
showers
Isotopes
radii
products
profiles

Keywords

  • Chondrites
  • Cosmogenic radionuclides
  • Model calculations
  • Pre-atmospheric size
  • Production rates

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

Identifying large chondrites using cosmogenic radionuclides. / Welten, K. C.; Caffee, M. W.; Hillegonds, D. J.; Masarik, J.; Nishiizumi, K.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 268, No. 7-8, 04.2010, p. 1185-1188.

Research output: Contribution to journal › Article

Welten, KC, Caffee, MW, Hillegonds, DJ, Masarik, J & Nishiizumi, K 2010, 'Identifying large chondrites using cosmogenic radionuclides', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 268, no. 7-8, pp. 1185-1188. https://doi.org/10.1016/j.nimb.2009.10.129
Welten KC, Caffee MW, Hillegonds DJ, Masarik J, Nishiizumi K. Identifying large chondrites using cosmogenic radionuclides. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2010 Apr;268(7-8):1185-1188. https://doi.org/10.1016/j.nimb.2009.10.129
Welten, K. C. ; Caffee, M. W. ; Hillegonds, D. J. ; Masarik, J. ; Nishiizumi, K. / Identifying large chondrites using cosmogenic radionuclides. In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2010 ; Vol. 268, No. 7-8. pp. 1185-1188.
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AB - We measured the concentrations of the cosmogenic radionuclides 10Be, 26Al, 36Cl and 41Ca in the metal and stone fractions of three large chondrite showers to determine their pre-atmospheric size. Large chondrites are characterized by substantial contributions of neutron-capture 41Ca in the stone fraction (up to ∼2 dpm/gCa), low radionuclide concentrations in the metal fraction and high 10Be(stone)/10Be(metal) ratios. Based on the measured concentrations in comparison with calculated cosmogenic nuclide depth profiles, using a semi-empirical and a purely physical model, we conclude that these objects had pre-atmospheric radii ranging from ∼80 cm to >3 m. We conclude that the semi-empirical model is more reliable for spallogenic production rates in large objects, while the purely physical model is more reliable for neutron-capture products.

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