Use of Chinese LiF:Mg,Cu,P (GR-200) TL detectors at therapy-level absorbed doses.
The objective was to find out whether or not the highly radiation-sensitive Chinese thermoluminescent (TL) LiF:Mg,Cu,P (GR-200) detector pellets can be used in therapy-level dosimetry. For this purpose the precision was investigated at an absorbed dose level of 1 Gy using a commercial TL read-out instrument. Relative standard deviations, sigma rel, of the individual calibration factors were found to be in the range between 0.2% and 0.6% from 30 randomly selected detectors, with the mean at 0.37%. Apart, linearity checks between 1 and 6 Gy resulted into a sublinear response of up to -4% which was successfully corrected for by a third-order polynomial curve fit. The residual signal turned out to be about 0.1% after one annealing cycle almost independent of the applied dose, and this figure could be reduced by two more decades after repeated annealing cycles.
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GSF-National Research Center for Environment and Health, Institute of Radiation Protection, Neuherberg, Germany.
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D003300:Copper; D004307:Dose-Response Relationship, Radiation; D005459:Fluorides; D018020:Lithium Compounds; D008274:Magnesium; D010758:Phosphorus; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013819:Thermoluminescent Dosimetry / Q000379:methods*
D018020:Lithium Compounds; C027651:lithium fluoride; D010758:Phosphorus; D003300:Copper; D008274:Magnesium; D005459:Fluorides