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

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 used for absolute dose measurement Equinox accelerator. A comparison of by different IAEA protocols TRS-277 TRS-398 has been studied. Analyzing TRS-398, a common shaped empirical formula was developed the four units Medical Colleges Bangladesh fitting parameters. It found that an average discrepancy determination absorbed water among 1.33 % chamber 0.65 combined uncertainty ±1.59 (k=1). good convergence obtained concepts methods study.