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All Journal Indonesian Journal of Applied Science and Technology Indonesian Journal of Educational Innovation
Bayu Septiawan
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Estimasi Dosis CT Scan Abdomen Nonkontras Dewasa Berdasarkan CTDIvol dan DLP RSUD NTB Bayu Septiawan
Indonesian Journal of Applied Science and Technology Vol. 6 No. 1 (2025): Edisi Januari-Juni 2025
Publisher : Indonesian

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Abstract

Abdominal computed tomography (CT) is a widely used diagnostic imaging modality but may result in relatively high exposure to ionizing radiation. Therefore, radiation dose evaluation is necessary to ensure patient safety in accordance with optimization principles. This study aimed to analyze the distribution of radiation doses in non-contrast abdominal CT examinations for adult patients at RSUD Province of West Nusa Tenggara based on Computed Tomography Dose Index volume (CTDIvol) and Dose Length Product (DLP), and to compare the results with the Indonesian Diagnostic Reference Level (IDRL) established by BAPETEN. A descriptive quantitative method with an observational approach was applied to 60 adult patient data collected from July to August 2024. CTDIvol and DLP values were obtained from the CT scanner workstation and analyzed using descriptive statistics. The results showed an average CTDIvol of 14.86 mGy with a 75th percentile of 16 mGy, and an average DLP of 775.87 mGy·cm with a 75th percentile of 838 mGy·cm. Overall, the radiation dose values were below the IDRL limits set by BAPETEN in 2021, although several cases exceeded the reference. These findings indicate that the abdominal CT scanning protocol at RSUD Province of West Nusa Tenggara generally complies with radiation dose optimization standards.
Design and Development of a Free-Fall Experiment Apparatus Based on a Photodiode Sensor Bayu Septiawan; Naufal Rizky Akbar; Fauzan Najib Habibi
Indonesian Journal of Educational Innovation Vol. 1 No. 2 (2025): August
Publisher : Yayasan Siti Widhatul Faeha Salahudin Syawal

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The integration of technology in education, particularly through sensor- and microcontroller-based experimental tools, has proven effective in enhancing the accuracy and efficiency of science learning. This study aims to design a free-fall motion experiment apparatus utilizing a photodiode sensor and Arduino Nano to improve time and gravitational acceleration measurements. The design includes hardware components (electromagnetic ball release, laser, photodiode sensor, and LCD) and software using the Arduino IDE. Experiments at heights of 0.2 m, 0.4 m, and 0.6 m yielded average gravitational acceleration values of 9.715 m/s², 9.787 m/s², and 9.819 m/s², respectively, close to the theoretical value of 9.8 m/s² with low standard deviations (0.351, 0.323, 0.311) m/s². The sensor’s fast response (0.001 milliseconds) demonstrates the tool’s effectiveness in minimizing manual error. These findings suggest that integrating a photodiode sensor with an Arduino Nano can produce an accurate and efficient tool for physics experiments. Further development, such as automated height adjustment, is recommended to enhance measurement precision.
Co-Authors Fauzan Najib Habibi Naufal Rizky Akbar