Radiant energy – Invisible radiant energy responsive electric signalling – With heating of luminophors
Patent
1984-09-20
1987-01-20
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With heating of luminophors
2503541, G01T 1115
Patent
active
046381635
ABSTRACT:
An apparatus and method 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 nearly constant. 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 optical 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 thermoluminescent phosphors. Also disclosed are preferred signal processing and control circuits.
REFERENCES:
patent: 3531641 (1970-09-01), Weissenberg
patent: 3729630 (1973-04-01), Yamashita et al.
patent: 4204119 (1980-05-01), Yasuno et al.
patent: 4507562 (1985-03-01), Gasiot et al.
Gasiot et al, "Laser Heating in Thermoluminescence Dosimetry", J. Appl, Phys., 53 (7), Jul. 1982, pp. 5200-5209.
Abstract, "Heating of Continuous Thermoluminescent Layers with Localized Laser Beams", by P. Braunlich, S. C. Jones, A. Abtahi, and M. DeMurcia, Department of Physics, Washington State University, Pullman, Washington.
J. Radiation Protection Dosimetry, 6, Apr. 1984.
Braunlich Peter F.
Tetzlaff Wolfgang
Braunlich Peter F.
Fields Carolyn E.
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