Author(s)

Sudeb Kumar Roy¹, Pretam Kumar Das¹, Rajada Khatun², Md. Ashikur Rahman³, Shirin Akter^2*, Tushar Kumar¹, Mohammad Monjur Ahasan³

¹Department of Physics, Pabna University of Science and Technology, Pabna, Bangladesh.
²Medical Physics Division, Atomic Energy Centre, Dhaka, Bangladesh.
³Institutes of Nuclear Medical Physics, Atomic Energy Research Establishment, Savar, Dhaka, Bangladesh.

Dosimetric characteristic is one of the essential parameters of a medical linear accelerator (LINAC), which must be obtained before clinical use. The dosimetric characteristics for 6 MV photon beam were measured and compared with the corresponding published data. The study was done using a Varian linear accelerator (Model Clinac-iX) at the Institute of Nuclear Medical Physics (INMP), AERE, Savar, Dhaka, under the Bangladesh Atomic Energy Commission (BAEC). The data is taken for 10 field sizes (2 × 2, 3 × 3, 5 × 5, 7 × 7, 10 × 10, 15 × 15, 20 × 20, 25 × 25, 30 × 30 and 40 × 40 cm²) at same conditions. The measured Percent Depth Dose (PDD) curves were obtained for 6 MV photon beams with the field as mentioned above and compared with the calculated PDD curves. The measured depth dose (D_max) for reference field size (FS) 10 × 10 cm² is 15.99 mm, and the PDD at 10 cm depth (D₁₀) is 66.87% for 6 MV photon energies that are found to be compatible with the published report BJR supplement 25. The measured PDD curves for photon energies show a good agreement with the standard PDD curves. The photon beam dosimetry data found in the current study are compatible and all the tolerances are within the clinically acceptable tolerance limit.

Linac Machines, 3D Water Phantom, Ionization Chamber, Electrometer

Roy, S. , Das, P. , Khatun, R. , Rahman, M. , Akter, S. , Kumar, T. and Ahasan, M. (2021) Dosimetric Characteristics of 6 MV Medical Linac at BAEC. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 10, 38-46. doi: 10.4236/ijmpcero.2021.101004.