Dosimetry audit for megavoltage photon beams applied in non-reference conditions

Fadzil, Muhammad Safwan Ahmad and Noor, Noramaliza Mohd and Min, Ung Ngie and Abdullah, Norhayati and Dolah, Mohd Taufik and Pawanchek, Mahzom and Bradley, David Andrew (2022) Dosimetry audit for megavoltage photon beams applied in non-reference conditions. Physica Medica-European Journal of Medical Physics, 100. pp. 99-104. ISSN 1120-1797, DOI

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We have conducted for the first time a Malaysian postal dosimetry audit of external beam under nonreference conditions by evaluating the output performance while screening for systematic errors within the dosimetry chain. The potential use from the choice of detector were investigated along with the search for other sources of discrepancies. Methods: Ten radiotherapy centres were audited, encompassing 16 megavoltage photon beam arrangements, adopting the IAEA postal dosimetry protocol for non-reference conditions, with a holder modified to accommodate three TLD types: Ge-doped cylindrical silica fibres (CF), Ge-doped flat silica fibres (FF), and TLD-100 powder. Results: Eight of the centres operated within +/- 5% of stated dose, one other exceeding tolerance for all measured points, and one did not return any dosimeters for analysis after failing the initial irradiations. Post remedial measures, the mean relative response for CF, FF, and TLD-100 was 1.00, 0.99, and 0.98 respectively, with associated coefficients of variation 6.87%, 6.45%, and 5.06%. Conclusion: High quality radiotherapy clinical practice postal dosimetry audits that are based on sensitive TLDs are seen to be particularly effective in identifying and resolving dose delivery discrepancies.

Item Type: Article
Funders: Ministry of Education, Malaysia [PRGS/1/2021/SKK07/UPM/02/1]
Uncontrolled Keywords: Dosimetry audit; TLD systems; Non-reference conditions
Subjects: R Medicine
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 22 Sep 2023 06:41
Last Modified: 22 Sep 2023 06:41

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