Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.537s&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 537
Astronomy and Astrophysics
Astronomy
Chondrites, Irradiation, Meteoritic Composition, Radiation Effects, Temperature Effects, Thermoluminescence, Anomalies, Astronomical Models, Computerized Simulation, Temperature Profiles
Scientific paper
The aim of this work is eventually to produce a computer program that models the build-up of themroluminescence (TL) in a meteorite as it orbits the Sun. In order to create such a program, it is necessary first to find out how the TL response of a meteorite is affected by various factors. Irradiation facilities in laboratories typically provide much larger dose rates than those encountered by meteorites as they orbit the Sun. A previous, brief study in this laboratory of the response of an enstatite chondrite to various dose rates revealed no significant dependence of TL output on dose rate. The samples used in the dose-rate study were subsequently given a test dose of about 10 Gy and reread in order to see if the 200-Gy predose at various dose rates had affected the TL sensitivity of the meteoritic samples. It was found that there was no significant change in sensitivity. It may therefore be necessary to include this dependence of TL sensitivity on irradiation temperature in any computer program that attempts to model the build-up of TL in an orbiting meteorite. The samples used in the experiment were afterward given a test dose of 10 Gy and then reread. It was found that the exposure of the samples to the 50-Gy predose at various temperatures had no significant effect on their subsequent TL sensitivity. A brief study of the effect of preirradiation annealing temperature on TL sensitivity was also made. Samples from three meteorites were annealed for 30 min at temperatures between 473 K and 973 K before being given a test dose of 50 Gy. The samples were the read and the height of the LT peak measured.
Durrani Saeed A.
Kharita M. H.
Stokes R.
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