Comparative Analysis of Radiation Dose Rate on Brachytherapy Commissioning Data and Radiation Safety Evaluation at R.T Notopuro Sidoarjo Hospital

2026-08-21T02:02:42+00:00

Brachytherapy is a modality of internal radiotherapy that utilize radioactive sources placed close to the target to increase effectiveness in cancer treatment. However, before the device is used in clinical service, commissioning is required to ensure that the device complies with factory specifications and radiation safety standards. This study aims to analyze the factors that cause the difference in radiation dose rate values between commissioning data and the results of radiation exposure measurement in 2026 on SagiNova brachytherapy machines with Cpbalt-60 radioactive sources at the Integrated Cancer Service Installation of R.T Notopuro Sidoarjo Hospital. The method used in this study is direct measurement using the Gamma Rad Eye G20-10 surveymeter at several measurement points with distances 5 cm and 1 m around the brachytherapy device. The results showed that at a distance of 5 cm there was a difference of 3.34 μSv/h to 19.34 μSv/h, while at a distance of 1 m there was a difference of 0.03 μSv/h to 0.75 μSv/h. The results obtained indicate that the dosage rate value in 2026 has a lower value than in the commissioning data due to the influence of the activity value of the Cobalt-60 source which decreases each time. However, the results showed that the measurement value was still within the safe limit of 20 mSv/year for radiation workers.

Comparative Analysis of Absolute Dosimetry of a Varian 2300iX LINAC for Photon and Electron Beams Using IAEA TRS-398 Rev. 1

2026-09-29T02:16:51+00:00

The accuracy of radiation dose output is one of the factors that determines the success of radiation therapy and patient safety. Therefore, an absolute dosimetry process based on international standards is required to ensure that the dose output from the Linear Accelerator (LINAC) is consistent with the planned dose. This study aimed to analyze absolute dosimetry results on a Varian 2300iX LINAC using the IAEA TRS-398 Rev.1 protocol for 6 MV photon and 6 MeV electron beams. Measurements were performed using a water phantom, a PTW 30013 Farmer Ionization Chamber for the photon beam, a PTW 34045 Advanced Markus Chamber for the electron beam, an electrometer, a thermometer, and a barometer under reference conditions with an SSD of 100 cm, a 10 × 10 cm² irradiation field, and 200 MU. Absorbed dose to water was calculated using the absorbed-dose-to-water approach with temperature and pressure (kTP), polarity (kpol), ion recombination (ks), and beam quality (kQ) correction factors. The results showed that before adjustment, the dose-output deviations were −0.860% for the 6 MV photon beam and −0.600% for the 6 MeV electron beam. After adjustment, the deviations changed to −0.050% for the 6 MV photon beam and 0.190% for the 6 MeV electron beam. All measurement results were within the ±2% tolerance recommended by IAEA TRS-398 Rev.1. Correction factors close to one indicated that the measurement conditions met international dosimetry requirements. The results demonstrate that the Varian 2300iX LINAC has good dosimetric performance and is suitable for radiotherapy services, provided that periodic quality assurance is maintained.

Faraday: Journal of Fundamental Physics, Research, and Applied Science

Comparative Analysis of Radiation Dose Rate on Brachytherapy Commissioning Data and Radiation Safety Evaluation at R.T Notopuro Sidoarjo Hospital

Comparative Analysis of Absolute Dosimetry of a Varian 2300iX LINAC for Photon and Electron Beams Using IAEA TRS-398 Rev. 1