Determination of quality parameters from statistical analysis of routine TLD dosimetry data.
Following the as low as reasonably achievable (ALARA) practice, there is a need to measure very low doses, of the same order of magnitude as the natural background, and the limits of detection of the dosimetry systems. The different contributions of the background signals to the total zero dose reading of thermoluminescence dosemeter (TLD) cards were analysed by using the common basic definitions of statistical indicators: the critical level (L(C)), the detection limit (L(D)) and the determination limit (L(Q)). These key statistical parameters for the system operated at NRC-Negev were quantified, based on the history of readings of the calibration cards in use. The electronic noise seems to play a minor role, but the reading of the Teflon coating (without the presence of a TLD crystal) gave a significant contribution.
German
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U
Nuclear Research Centre Negev, P.O. Box 9100, 84190 Beer Sheva, Israel. gur118@inter.net.il
Weinstein
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M
Pelled
O
O
D016477:Artifacts; D003627:Data Interpretation, Statistical; D016208:Databases, Factual; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D015233:Models, Statistical; D011785:Quality Assurance, Health Care / Q000379:methods*; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods