induced thermoluminescence
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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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a brief overview of tl
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

so what is the difference between natural and induced tl
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.
procedures
Procedures
  • Sample Preparation
  • TL (natural+induced)
  • Glow curve analysis
  • Data reduction
  • Final analysis & deductions
what parameters are we looking for
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.
slide8
As expected, the TL sensitivity values we obtained were consistent with high type 3 / low type 4 ordinary chondrites
can we compare these values to other parameters
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
conclusions
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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