Effect of Radiation Position of Photon Beam at Axis Point and Field Edge on Absorbed Dose on Linear Accelerator (Linac)

Nur Alya; Robert Janssen  Stevenly; Pratiwi Sri  Wardani; Erlinda Ratnasari  Putri

doi:10.31572/inotera.Vol9.Iss1.2024.ID307

Nur Alya Physics Study Program, Mulawarman University
Robert Janssen Stevenly Radiotherapy Installation, A.W. Sjahranie Hospital
Pratiwi Sri Wardani Physics Study Program, Mulawarman University
Erlinda Ratnasari Putri Physics Study Program, Mulawarman University

DOI: https://doi.org/10.31572/inotera.Vol9.Iss1.2024.ID307

Keywords: Ionization detector, Photon dose, Linac, TRS 398

Abstract

Radiotherapy is a medical treatment that uses ionizing radiation to kill cancer cells using a Linear Accelerator (Linac). One of the errors in radiotherapy irradiation can occur because the radiation beam that comes out is not in accordance with the planning. Therefore, radiation absorbed dose measurement is needed to carry out as a quality assurance to control the accuracy and suitability of the dose to be received by the patient by following the standards of the Technical Report Series (TRS) 398. This study was conducted at Radiotherapy Installation of RSUD A.W. Sjahranie Samarinda. In the measurement of radiation absorbed dose, the detector was placed in the center of the water phantom with a certain depth and placed in an axis position perpendicular to the radiation source. The detector is not only placed in the axis position, but also placed on the 4 edges of the field with the aim of knowing the effect of the location of the detector on the absorbed dose on the Linac plane. Medium water phantom, Farmer type ionization detector with a depth of 10 cm, and radiation source distance to the phantom surface of 100 cm were applied in this study. The measurement deviation results at the axis position and 4 field edges are 0.01%, 0.06%, 0.03%, 0.05%, and 0.05%. These values are within the tolerance limits written in the IAEA TRS 398 protocol, which is ± 2%. This states that the radiation absorbed dose by the water phantom is homogeneous in all directions.

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