Vol 2, No 2 (1997)
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Published online: 1997-01-01

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Some clinical applications of MTS-type TLD detectors

M. Waligórski12, J. Lesiak12, T. Byrski12, P. Olko12, P. Bilski12
DOI: 10.1016/S1428-2267(97)70151-0
Rep Pract Oncol Radiother 1997;2(2):62.

Abstract

An important part of any QA programme for radiotherapy is verification, in vitro or in vivo, of calculated doses and dose distributions. We studied the clinical applicability of LiF:MG, Ti sintered TL detectors produced, as type MTS-N, by the Institute of Nuclear Physics in Kraków (INP). These are solid pellets of diam 4.5mm and 0.8mm thickness. The TL reader was a modified planchet-type 770A, also produced at the INP, with linear heating and computerised glow curve recording.

For analysis of in vivo applications, we measured, in a water phantom, the dose at 14 points aroud the Standard gynaecological applicator of our SELECTRON LDR/MDR afterloading unit with Cs-137 pellets and compared the measured values with doses calculated at these points by the in-house developed SELKOM computer code used for planning gynaecological brachytherapy at the Centre of Oncology in Kraków (COK). Agreement to within 5% was stated.

To demonstrate the applicability of MTS dosemeters in calibration dosimetry, we studied the accuracy, stability and reproducibility of a batch of 100 detectors over several readout cycles at doses ranging from 0.5 to 2.5 Gy. At 1 Gy, the relative standard deviation of Individual Calibration Factors (ICF) over six readout cycles did not exceed 2.5% indicating that the error of dose estimation using individual MTS detectors should not exceed 2%.

In an intercomparison of Co-60 beams at the COK and at Louvain performed with MTS detectors agreement to within less than 0.5% was found with an accuracy better than 1%.

This work is partly supported by KBN Polish State Committee for Scientific Research, Research Project No. 8T11E02908.

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Reports of Practical Oncology and Radiotherapy