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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram
M, I Wayan Ari
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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A ZE25A-O3 Sensor-Based Solution for Continuous Ozone Level Measurement in LINAC Environments Khasanah, Nur; Hudha, Lalu Sahrul; Jamiluddin, Jamiluddin; Ernita, Nevi; Bunawas, Bunawas; M, I Wayan Ari; Subroto, Rinarto
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol. 13 No. 4: October 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-ps.v13i4.16540

Abstract

Abstract Ozone (O₃) generated during LINAC operation can accumulate indoors and pose respiratory risks, yet many facilities lack continuous monitoring. We designed and validated a low-cost, electrochemical sensor platform—ZE25A-O₃ integrated with an Arduino Mega, on-board logging, and a Nextion HMI—for real-time surveillance in a LINAC suite. The sensor was calibrated at 24 °C and 40% RH against 0.5–1.5 ppm standards, yielding slope = 1.045, intercept = −0.04067 ppm, R² = 0.99984, and RMSE = 9.39 ppb, supporting reliable low-ppb quantification. Time series were aggregated into 30-min bins with centered 1-h rolling means to extract diurnal structure while suppressing short-term fluctuations. Field measurements showed a 20–30 ppb background with intermittent spikes exceeding 100 ppb (peaks ~150 ppb). A reproducible daily pattern emerged: late-morning minima (~20–21 ppb) followed by evening enhancement (~26–28 ppb), consistent with ventilation and operational schedule. Average conditions were below the Indonesian workplace limit of 100 ppb, but episodic exceedances motivate real-time alerts and ventilation management. This work demonstrates a practical approach for continuous exposure assessment and data-informed environmental control in radiotherapy facilities.
Measurement and Risk Analysis of Ozone (O3) Concentrations in the 9 MeV and 12 MeV Electron Mode LINAC Khasanah, Nur; Raehanah; Bunawas; M, I Wayan Ari; Subroto, Rinarto; H, Lalu Sahrul; A, Paramita Putri; Ulfariah, Dia
Jurnal Penelitian Pendidikan IPA Vol 10 No 2 (2024): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i2.5347

Abstract

This study investigates potential non-radiation hazards, specifically Ozone (O3) production, during Linear Accelerator (LINAC) electron mode radiotherapy. The research uses experimental measurements to determine Ozone concentration in the LINAC patient waiting room and control room. Measurements are taken assuming a ±2-hour delay in one working day, using 9 MeV and 12 MeV energy, 400 MU dose rate, and illumination angles of 0o, 90o, and 270o. Maximum Ozone concentrations in the LINAC patient waiting room and control room are found to be 6.6 ppb (12 MeV) and 8.3 ppb (12 MeV), respectively. These concentrations fall below the chemical threshold limit and are deemed safe for human exposure. Notably, potentially detectable Ozone levels are observed in the LINAC banker. Overall, this research highlights the importance of monitoring Ozone levels to ensure the safety of both patients and personnel in LINAC facilities.
Co-Authors A, Paramita Putri Bunawas Bunawas Bunawas Ernita, Nevi H, Lalu Sahrul Jamiluddin, Jamiluddin Lalu Sahrul Hudha Nur Khasanah Raehanah Rinarto Subroto Ulfariah, Dia