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COSMOGENEIC RADIONUCLIDES IN THE HAVERÖ METEORITE
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An 87‐gram sample of the Haverö ureilite has been analyzed by non‐destructive gamma‐ray spectrometry. The results of the measurements, in dpm/kg at time of fall, are: 22Na, 71 ± 3; 26Al, 43 ± 3; 46Sc, 3.4 ± 2.1; 54Mn, 35 ± 6; 60Co, 0.7, 2*** limit. Haverö has 77 ± 14% of the 26Al activity calculated for its chemical composition. When averaged with previously‐reported analyses of Goalpara and Novo Urei, ureilites as a class have 74 ± 7% of their expected 26Al activity. The depletion in 26Al could be the coincidental result of identical “shielding” effects in three meteorites of apparently very different preatmospheric sizes. Alternatively, ureilites may have been exposed to a lower cosmic‐ray flux than that experienced by most chondrites, probably the result of characteristically different orbits
Title: COSMOGENEIC RADIONUCLIDES IN THE HAVERÖ METEORITE
Description:
An 87‐gram sample of the Haverö ureilite has been analyzed by non‐destructive gamma‐ray spectrometry.
The results of the measurements, in dpm/kg at time of fall, are: 22Na, 71 ± 3; 26Al, 43 ± 3; 46Sc, 3.
4 ± 2.
1; 54Mn, 35 ± 6; 60Co, 0.
7, 2*** limit.
Haverö has 77 ± 14% of the 26Al activity calculated for its chemical composition.
When averaged with previously‐reported analyses of Goalpara and Novo Urei, ureilites as a class have 74 ± 7% of their expected 26Al activity.
The depletion in 26Al could be the coincidental result of identical “shielding” effects in three meteorites of apparently very different preatmospheric sizes.
Alternatively, ureilites may have been exposed to a lower cosmic‐ray flux than that experienced by most chondrites, probably the result of characteristically different orbits.
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