Dosimetric Characteristics of 6 MV Medical Linac at BAEC

• 作者: Sudeb Kumar Roy Pretam Kumar Das Rajada Khatun Md. Ashikur Rahman Shirin Akter Tushar Kumar Mohammad Monjur Ahasan
• 来源期刊: 医学物理学、临床工程、放射肿瘤学(英文)
• 学科: 物理学
• 关键词: Linac Machines 3D Water Phantom Ionization Chamber ELECTROMETER
• 年，卷（期）: 2021,（1）
• 页码范围: 38-46
• 页数: 9页
• 分类号: O57

摘要

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.