PMID: 19145678Jan 16, 2009Paper

On the evaluation of the relative sensitivity of commercial TLD readers using well characterized TLD chips

Journal of B.U.ON. : Official Journal of the Balkan Union of Oncology
T RolandN Papanikolaou

Abstract

To characterize a relative sensitivity or performance factor between two commercial thermoluminescent dosimeter (TLD) readers that can be used in inter comparing the thermoluminescent (TL) signals from the readers. The measurements were made with well-characterized TLD chips, TLD-100 (LiF: Mg; Ti). For illustrative purposes, we used the Harshaw TLD-5500 and the Victoreen 2800M TLD readers available in our department. A well-calibrated 6 MV beam linear accelerator was used as the source of radiation. A sensitivity factor between the two readers used in the illustration was measured as 3.40 +/- 0.13 with the Harshaw TLD-5500 reader producing the superior sensitivity. In terms of measurement repeatability, we observed 2.32% +/- 1.17% reproducibility with the Victoreen 2800M TLD reader and 1.86% +/- 0.95% reproducibility with the Harshaw TLD - 5500 reader. The linearity properties of the two readers were comparable. The sensitivity factor is to be interpreted as follows: when working with multiple TLD readers, in this case two, suppose the calibration of the TLD chip was performed with one of the readers, then we can use this calibration factor when measurements are made with the other reader provided we correct for differences in ...Continue Reading

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