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- W2068276097 abstract "Abstract In the Antarctic H4 chondrite ALHA 78084 measurements of 26 Al, 53 Mn, noble gases and cosmic ray tracks have been performed on documented samples to investigate depth dependences of cosmic-ray-induced effects. 26 Al activities vary between 224 and 246 dpm/kg Si equ . 53 Mn activities range from 299 to 359 dpm/kg Fe in agreement with the Kohman and Bender model [1]. 22 Ne/ 21 Ne ratios between 1.145 and 1.176 are observed. The 3 He/ 21 Ne vs. 22 Ne/ 21 Ne correlation shows a trend line similar to those found for St. Severin and Keyes. Track data indicate ablation depths between 1.3 and 6.5 cm with a mean ablation of 3.8 cm. This leads to a preatmospheric mass of about 40 kg and an ablation loss of about 66% by mass. Preatmospheric size and shielding calculated from measured 22 Ne/ 21 Ne ratios using the semi-empirical curves of Bhandari and Potdar [2] agree with those derived from track measurements. The combined data of spallation nuclides and cosmic ray tracks indicate a simple one-stage irradiation as a small object with a preatmospheric radius of ( 14 ± 1 ) cm for about 32 m.y. and a terrestrial age of less than 170,000 years." @default.
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- W2068276097 date "1985-05-01" @default.
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- W2068276097 title "Cosmic ray effects in the Antarctic meteorite Allan Hills A 78084" @default.
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- W2068276097 doi "https://doi.org/10.1016/0012-821x(85)90066-4" @default.
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