Physics
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..675p&link_type=abstract
Meteoritics, vol. 31, pages 675-680.
Physics
3
Scientific paper
Cosmic ray track densities (CRTDs) have been measured on several spot samples from two Jilin specimens from the strewnfield (VI-21-057 and VI-42-04), along with 60Co activity in 3 and 4 sections respectively of the same specimens. The observed CRTD gradient agrees remarkably well with that predicted by Bhattacharya et al.'s calculations (1973) of CRTD variation as a function of shielding depth, indicating a negligible contribution from the first (2p) irradiation stage. The shortest distance of each specimen to the preatmospheric surface is 3.6 cm and 6.8 cm respectively. The distance scale deduced from these measurements allows to determine the variation of 60Co activity with shielding depth, at low depth values, which is found to be much less steep than model predictions. Two slightly different 60Co profiles are proposed, corresponding to the two specimens studied. The mean preatmospheric radius of the Jilin chondrite is 85 +/- 8 cm, the uncertainty reflecting in part the meteoroid surface roughness.
Bourot-Denise Michèle
Heusser Gerd
Ouyang Zhongcan
Pellas Paul
Perron Claude
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