Measurement of Absorbed Dose in Water Using Co-60 gamma source Teletherapy Units According to IAEA Dosimetry Protocols

Md. Minhaj Hossain; Santunu Purohit; Tanjim Siddiqua; Md. Shakilur Rahman; Mohammed Didarul Alam Mojumder; Md Jubayer Rahman Akhand; AKM Moinul Haque Meaze

doi:10.24996/ijs.2022.63.10.13

Authors

Md. Minhaj Hossain Department of Physics, University of Chittagong https://orcid.org/0000-0001-8740-9594
Santunu Purohit Department of Physics, University of Chittagong https://orcid.org/0000-0002-0029-995X
Tanjim Siddiqua Secondary Standard Dosimetry Laboratory, Institute of Nuclear Science & Technology, Bangladesh Atomic Energy Commission https://orcid.org/0000-0001-8920-340X
Md. Shakilur Rahman Secondary Standard Dosimetry Laboratory, Institute of Nuclear Science & Technology, Bangladesh Atomic Energy Commission https://orcid.org/0000-0002-7873-7999
Mohammed Didarul Alam Mojumder Department of Physics, Chattagram Cantonment Public College, Bangladesh
Md Jubayer Rahman Akhand Department of Physics, Bangladesh Military Academy, Bhatiary, Chittagong https://orcid.org/0000-0002-4406-0369
AKM Moinul Haque Meaze Department of Physics, University of Chittagong, Bangladesh https://orcid.org/0000-0002-1526-2113

DOI:

https://doi.org/10.24996/ijs.2022.63.10.13

Keywords:

Co-60 Teletherapy Units, Technical Report Series (TRS), Absorbed Absolute Dose

Abstract

Modern radiotherapy facilities like 3-Dimensional conformal radio therapy (3DCRT), Intensity Modulated Radiotherapy (IMRT), were recently suggested in Co-60 machine with Multi-leaf Collimator (MLC). In this study, two reference chambers NE-2571#1205 and NE2581#537 were used for absolute dose measurement in Equinox accelerator. A comparison of dose measurement by two different IAEA protocols TRS-277 and TRS-398 has been studied. Analyzing TRS-398, a common shaped empirical formula was developed for the four Co-60 units of four Medical Colleges in Bangladesh with fitting parameters. It was found that an average discrepancy in the determination of absorbed dose in water among the two different protocols TRS-277 and TRS-398 were 1.33 % for the chamber NE-2571#1205 and 0.65 % for the chamber NE2581#537 with combined uncertainty ±1.59 % (k=1). A good convergence has been obtained in the concepts and methods in this study.