Impact of reading pre-irradiation background signal on the post-irradiation glow curves of thermoluminescence dosimeters

El-Hafez, A. I. Abd; Maghraby, Ahmed M.

doi:10.1016/j.apradiso.2011.06.011

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…The variability of reader variability index (RVI) can be expressed by the coefficients percentage of mean value of the variation of every cycle of readings and this amount provides a long term reader reproducibility. The mean corrected readings for each cycle are shown in last row of Table (2). By determining the coefficients percentage of variation of these results the variability index (RVI) of the TL reader only could be obtained.…”

Section: Calculation Of Reader Variability Index (Rvi)mentioning

confidence: 99%

“…The subsequent factors are responsible for determining the dosimetry properties of a TLD system: thermoluminescence reader (PM dark and read out profile), thermoluminescence material (batch quality and batch history) and annealing proceeding calibration irradiation system. Furthermore, the background reading (zero dose) of TLDs plays a very important role in all accurate dosimetry proceedings in order to correct additive doses appearing from alternative supplies as compared to irradiation processes [2][3][4]. For performing exact dosimetry, a good knowledge of optimum dosimetry procedures should be available.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of Various Factors Influencing Repeatability and Reproducibility of TLD-600 Detector

Elsheikh

El-Hafez

Ahmed

et al. 2019

Arab Journal of Nuclear Sciences and Applications

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Various factors affecting the random and systematic error in the repeatability and reproducibility of thermoluminescent 6 LiF:Mg,Ti dosimeters were investigated. These characteristics were examined by irradiating them at different doses in the range 3.8 µG to 433.94 mGy from a Cs-137 gamma source. Values of the element correction factors (ECFs) were obtained by exposing the chips to a dose of 433.93 mGy five times. This investigation denotes that more correction will be obtained by calculating the error due to non-subtracting zero dose reading from the delivered dose, which decreases the coefficient of variation as a percentage of the mean from the range of 2.4%-18.6% to only 0.7%-16.9%. Using the individual sensitivity factor and repeating five calibrations decreases the coefficient of variation as a percentage of the mean to only 0.54%. The values of the Variability Index for System (SVI), Reader (RVI) and Detector (DVI) are 1.46 %, 1.40% and 0.34% respectively. Also, it is clear from the results that the best repeatability and reproducibility obtained by using the element correction factor was associated with each dosimeter rather than carefully selecting the individual dosimeters. Finally, from the results, it can be noted that at low doses, the value of relative coefficient of variation becomes very large, while at high doses, it becomes basically constant and of the order of a few percentage.

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Section: Calculation Of Reader Variability Index (Rvi)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%