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Induced Thermoluminescence

Induced Thermoluminescence. Mateo Naranjo. A brief overview of TL. What is TL? -It’s the thermally stimulated emission of light from a material What are the requirements for TL to happen?

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Induced Thermoluminescence

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  1. Induced Thermoluminescence Mateo Naranjo

  2. A brief overview of TL • What is TL? -It’s the thermally stimulated emission of light from a material • What are the requirements for TL to happen? -The material has to be either an insulator or semiconductor (that’s why we take off all the metallic part of the meteorite first!) -Material must have been exposed to radiation -It must be stimulated by heating

  3. So what is the difference between natural and induced TL? • Natural TL (Stacy’s part) is produced by a sample in the “as received” state. • Induced TL is produced by a sample drained off it’s NTL and subjected to a standard radiation dose. The measurement of ITL will provide info on the mineralogy and nature of the particles.

  4. Procedures • Sample Preparation • TL (natural+induced) • Glow curve analysis • Data reduction • Final analysis & deductions

  5. Block diagram for TL measurement apparatus • Gg

  6. What parameters are we looking for? • For ITL, important parameter is TL sensitivity • It’s calculated as the average PH (peak height) of sample normalized to the Dhajala meteorite.

  7. What values did we get?

  8. As expected, the TL sensitivity values we obtained were consistent with high type 3 / low type 4 ordinary chondrites

  9. Can we compare these values to other parameters? • Yes! We can compare them to Olivine and Pyroxene PMD, a mineralogical measure of the scatter, and see if we spot any trends

  10. Conclusions • Our TL sensitivity values agreed with high type 3 / low type 4 ordinary chondrites • Further comparison with PMD showed a proportionallity trend between TL sensitivity and pyroxene PMD ==> PMD goes down as TL sens. goes up • The olivine PMD shows no relation to TL sensitivity (because diffusion is much faster in ol)

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