Apparatuses and methods for laser reading of thermoluminescent p

Details Apparatuses and methods for laser reading of thermoluminescent p Apparatuses and methods for laser reading of thermoluminescent p

1986-07-07

1989-06-13

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

With heating of luminophors

2503541, G01T 1115

Patent

active

048395188

ABSTRACT:
Apparatuses and methods for rapidly reading thermoluminescent phosphors to determine the amount of luminescent energy stored therein. The stored luminescent energy is interpreted as a measure of the total exposure of the thermoluminescent phosphor to ionizing radiation. The thermoluminescent phosphor reading apparatus uses a laser to generate a laser beam. The laser beam power level is monitored by a laser power detector and controlled to maintain the power level at a desired value or values which can vary with time. A shutter or other laser beam interrupting means is used to control exposure of the thermoluminescent phosphor to the laser beam. The laser beam can be equalized using an opitcal equalizer so that the laser beam has an approximately uniform power density across the beam. The heated thermoluminescent phosphor emits a visible or otherwise detectable luminescent emission which is measured as an indication of the radiation exposure of the thermoluminscent phosphors. Also disclosed are preferred signal processing and control circuits including one system using a digital computer. Also disclosed are time-profiled laser power cycles for pre-anneal, read and post-anneal treatment of phosphors.

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Abstract "Heating of Continuous Thermoluminescent Layers with Localized Laser Beams", by P. Braunlich et al., Journal of Radiation Protection Dosimetry, vol. 6, issues 1-4 (as a unit) Apr. 1984.
Gasiot et al., "Laser Heating in Thermoluminescence Dosimetry", J. Appl. Phys., 53(7), Jul. 1986, pp. 5200-5209.
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