Laser Heating Of Thermoluminescent Microdosimeters: Prospects In Application To Imagery By Ionizing Radiations

J. Gasiot; J. P. Fillard; P. Braunlich

doi:10.1117/12.932929

9 August 1983 Laser Heating Of Thermoluminescent Microdosimeters: Prospects In Application To Imagery By Ionizing Radiations

J. Gasiot, J. P. Fillard, P. Braunlich

Author Affiliations +

Proceedings Volume 0312, 1st European Conf on Cineradiography with Photons or Particles; (1983) https://doi.org/10.1117/12.932929
Event: 1st European Conference on Cineradiography with Photons or Particles, 1981, Paris, France

Abstract

Heating of thermoluminescent materials by pulsed or continuous laser beams is shown to be an attractive means for rapid reading of discrete or continuous two dimensional arrays; applications of this novel laser heating techniques to thermoluminescence imaging of spatial intensity of ionizing radiation with perspectives, in X-ray or y-ray imaaery is considered. The thermoluminescence (TL) phenomenon is based on the presence of electron and/or hole traps which, upon exposure of the TL material to ionizing radiation, become occupied with the respective charge carriers. Thermal energy is provided -- usually in form of a linear heating program -- to release the trapped carriers. During this process recombination takes place and photons may be emitted until the thermal equilibrium distribution of all carriers is reestablished 1. The number of luminous photons emitted during the heating period is usually proportional to the ionizion irradiation of the material. Our experiments have been done with thin layer dosimeters made by powder deposition of CaF2, CaSO4... on glass sheet (22 mm x 22 mm) with a thickness ranae of 5 to 100 μm. The irradiation was achieved with a Cs 137-γ -source (.66 MeV). The typical irradiation was from 10 mR to 10 R. A 10 watts CO2 laser has enabled to heat the layer by small point (.5mm diameter). The interest of such a pinpoint heating is obvious ; it enables a reading of the absorbed irradiation at this point or pixel in a relatively short time (10 ms < t < 103 ms) and in the future to consider the prospects in dynamics X-Ray image detection. Though our study has been left at a prospective and fundamental step its extrapolation a X-ray imagery can be considered ; that point will be approached with some details.

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J. Gasiot, J. P. Fillard, and P. Braunlich "Laser Heating Of Thermoluminescent Microdosimeters: Prospects In Application To Imagery By Ionizing Radiations", Proc. SPIE 0312, 1st European Conf on Cineradiography with Photons or Particles, (9 August 1983); https://doi.org/10.1117/12.932929

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