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All Journal Jurnal Fisika Unand
Wahyu Dwi Lestari
Teknik Mesin, Fakultas Teknik dan Sains, Universitas Pembangunan Nasional “Veteran” Jawa Timur, Indonesia
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Evaluasi Hubungan Deviasi dan Energi terhadap Kestabilan Keluaran Berkas Elektron pada Pesawat LINAC Varian TrueBeam Sakinah; Primasari Cahya Wardhani; Arie Chintya Martania; Nur Aini Fauziyah; Wahyu Dwi Lestari
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.1-8.2026

Abstract

This study aims to analyze the relationship between electron beam energy and electric charge, as well as the relationship between deviation and energy, to evaluate the output stability of the LINAC machine. Measurements were conducted at BPAFK Surabaya using a Varian TrueBeam LINAC at Hospital X, East Java. The study employed electron energies of 6 MeV, 9 MeV, 12 MeV, 16 MeV, and 18 MeV. The procedure included filling the water phantom with distilled water, setting the source-to-surface distance (SSD) to 100 cm with a radiation field size of 10 cm × 10 cm, and connecting the detector to the electrometer outside the LINAC room. Calibration was performed at the reference depth (Zref) based on the R₅₀ value from the Percentage Depth Dose (PDD) table according to the IAEA TRS-398 standard. Measurements were repeated five times with voltage variations of +300 V, −300 V, and +75 V. The results showed that the maximum electric charge occurred at 12 MeV at a depth of 2.96 cm, while the highest deviation, −0.15%, was observed at 16 MeV—still within the ±2% tolerance limit. Therefore, the LINAC machine is considered stable and suitable for use in radiotherapy.
Analisis Respons Dosimetri Phantom Berbasis PMMA dengan Variasi Media Air dan Nylon Menggunakan Sumber Cs-147 Berdasarkan Standar ISO 4037 Widya Rachma Wulan; Primasari Cahya Wardhani; Fajar Timur; Wahyu Dwi Lestari; Arie Chintya Martania
Jurnal Fisika Unand Vol 15 No 4 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.4.405-413.2026

Abstract

This study analyzes the dosimetric response of Polymethyl Methacrylate (PMMA)-based phantoms with water and nylon as alternative media for radiation dose measurement.. Cylindrical phantoms resembling human extremities were fabricated using 3D printing according to the ISO 4037 standard. Dose measurements used a Thermoluminescent Dosimeter (TLD) type Hp(10) with a Cesium-137 gamma source (662 keV) at angles of 0°, 40°, and 235°. The results show that the dose in nylon consistently produced higher dose values than water at all angles. The average dose ranged from (31,95–32,20) μGy (absorbed dose) and (31,95–32,20) μSv (equivalent dose), while the nylon medium ranged from. (33,03–33,45) μGy (absorbed dose) and (33,03–33,45) μSv The percentage difference between the two media was in the range of 2,61%–3,88%, which is close to the 5% dosimetry tolerance limit by the IAEA. This variation is influenced by the scattering characteristics of the nylon material, which increase the probability of radiation interaction, particularly Compton scattering. Additionally, standard deviation values indicate that the dose distribution in water is more homogeneous than in nylon. Nevertheless, the consistency of the dose values suggests that nylon possesses good radiological equivalence to water. Therefore, nylon has the potential to be used as an alternative material in dosimetry phantom fabrication, especially in conditions where the use of water is limited. 
Co-Authors Arie Chintya Martania Fajar Timur Nur Aini Fauziyah Primasari Cahya Wardhani Sakinah Widya Rachma Wulan