Radiant energy – Invisible radiant energy responsive electric signalling – With heating of luminophors
Patent
1994-05-17
1996-04-16
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
With heating of luminophors
2504843, G01T 111
Patent
active
055085237
ABSTRACT:
A dosimeter product that simplifies the process of dosimetry in medical diagnosis, therapy and other fields where high precision is needed. The dosimeter product is obtained by a unique training method which stabilizes the sensitivity of the dosimeter. Stability in sensitivity is established by a combination of high temperature cyclical annealing and low temperature furnace annealing. After the sensitivity of the dosimeters is stabilized, the dosimeters are then calibrated by generating for every dosimeter within a group element correction coefficients (ECCs) that compensate for the differences in sensitivity among the group of the dosimeters, bringing the sensitivity of each dosimeter to the sensitivity of the mean of the population. The result is a group of precalibrated dosimeters with stable sensitivity that are ready to use with established correction factors for individual TL response differences. This eliminates, among other things, the need for the end user to track individual dosimeters and to maintain annealing furnaces and fixtures. The dosimeters may be used to perform radiation dosimetry wherein the dosimeters are exposed to radiation after which the TL response of the dosimeter is read out. Accordingly, there is provided a dosimetry system comprising a dosimeter produced in accordance with the invention and a TLD reader for reading the TL response of the dosimeter. Also provided are an annealing tray and holder assembly useful in carrying out the method of the invention, a quench block and a storage case.
REFERENCES:
McKinlay, "Thermoluminescence Dosimetry" Adam Hilger Ltd., p. 135 (1981).
Harshaw/Bicron 5500-O-U-0793-003 Model 550 Automatic TLD Reader User's Manual, Section 4.0, pp. 4-1 to 4-14 (Jul. 1993).
J. H. Elliott, "Using Radiation Damage to Obtain A Large Quantity of Matched-Sensitivity Thermoluminescent Dosimeters", Health Physics, vol. 48, No. 3, pp. 309-314 (Mar. 1995).
Lau et al., "Large Enhancement of TLD-100 Sensitivity By Irradiation In A Reactor Core", Nuclear Instruments And Methods In Physics Research (1986).
Lakshmanan et al., "Comments On Large Enhancement Of TLD-100 Sensitivity By Irradiation In A Reactor Core", Nuclear Instruments And Methods in Physics Research (1987).
Folkard et al., "Sensitivity Enhancement Effects In The Themoluminescence Of LiF TLD-100 At Radiation Doses Below 10 Gy", Phys. Med. Biol. vol. 32, No. 6, pp. 769-773, (1987).
Horowitz, "The Annealing Characteristics Of LiF:MgTi", Radiation Protection Dosimetry, vol. 30, No. 4, pp. 219-230 (1990).
Masterson et al., "Pretransfusion Blood Irradiation: Clinical Rationale And Dosimetric Considerations," Med. Phys. 19(3) May/Jun. 1992.
Kron et al., "X-Ray Surface Dose Measurements Using TLD Extrapolation," Med. Phys. 20(3) May/Jun. 1993.
Toivonen, "Improving The Accuracy Of TLD Systems In Clinical Applications," Radiation/Protection Dosimetry, vol. 47 No. 1/4 pp. 497-503 (1993).
Pontikos Philip M.
Rotunda Joseph E.
Tawil Riad A.
Velbeck Kenneth J.
Bulson Don
Hanig Richard
Saint Gobain/Norton Industrial Ceramics Corp.
Ulbrich Volker R.
Willis Davis L.
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