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All Journal BERKALA FISIKA Jurnal Ilmiah Arena Tekstil Journal of Physics and Its Applications Jurnal Pijar MIPA Physics and Science Education Journal (PSEJ)
Pandji Triadyaksa
Department Of Physics, Faculty Of Science And Mathematics, Diponegoro University, Semarang
Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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Improving water absorption time and the natural silk strength (Bombyx Mori) using atmospheric dielectric barrier discharge plasma Zaenul Muhlisin; Muhammad Adrian Lathif; Fajar Arianto; Pandji Triadyaksa
Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v3i2.10658

Abstract

This researchaimed to obtain Dielectric Barrier Discharge plasma discharge characteristics with and without the placement of natural silkBombyx Mori on one of the electrodes. Furthermore, the strength and the water absorption time of the irradiated silk samples will be analyzed.  Plasma discharge is generated by connecting electrodes of point-to-plane configuration with a sheet of glass inserted on the plane electrode at atmospheric conditions. The characterization of plasma discharge, either with or without the natural silk samples' placement on the plane electrode, was performed by increasing A.C.'s high voltage power source to reach arch discharge. Theelectrode spacing varied from 0.7 cm to 2.5 cm with a 0.3 cm increment. Sample irradiation was performed using cold plasma for 5, 15, and 30 minutes respectively. Placing or not placing the natural silk samples on the plane electrode will increase the plasma's discharge current and increase the high voltage. Moreover, increasing the distance between the electrodes and placing the sample on the plane electrode decreases the discharge current. Using Scanning Electron Microscopy, it was found that increasing plasma irradiation time on samples decreases the silk thread'sdiameterand shortening its water absorption time. The strength of irradiated fabric was reduceduntil 15 minutes of irradiation. However, at 30 minutes of irradiation, there was an increase in sample thickness compared to control samples.
Dose Distribution of Pencil Beam Proton Therapy using Geant4 Simulation for Breast Cancer Treatment Budiman, Rizki; Sutanto, Heri; Tursinah, Rasito; Triadyaksa, Pandji
Journal of Physics and Its Applications Vol 7, No 2 (2025): May 2025
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i2.25067

Abstract

This study aims to obtain a Spread-Out Bragg Peak (SOBP) for breast cancer treatment using proton pencil beams Monte Carlo simulation. Proton beams with 2 MeV energy steps from 70 to 110 MeV were simulated using Geant 4 software to generate the SOBP. The optimization tool Linear Least Squares (lsqlin) was used to configure the proper proton beam weighting fraction. This tool successfully produced SOBPs within a depth range of 4-8 cm, 4-6 cm, and 5-7 cm. Comparison against a trial-and-error approach to creating SOBP by a different study shows that Linear Least Squares (lsqlin) approximation leads to a better SOBP.
A comparison of image quality of cerium oxide nanoparticles and iodine contrast agents in computed tomography scan Nasrullah, Faiz; Nurhasanah, Iis; Triadyaksa, Pandji; Rukmono, Dito Andi
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.6004

Abstract

Computed tomography (CT) scan, with iodine-based contrast, produces good image quality by improving the visualisation of relatively low-contrast internal body structures. However, the impact of using iodinated difference should be considered in patients susceptible to contrast allergy and renal impairment. Therefore, alternative contrast materials, such as cerium oxide nanoparticles (CeO2 NPs), must be used, with biocompatible properties and strong X-ray attenuation capabilities. This study compared the CT scan image quality of CeO2 NPs and iodinated contrast agents. This experimental study started by preparing a suspension of CeO2 NPs and iodine in aquabidest at a concentration of 500 ppm. The suspension was scanned using a CT scan with a helical scanning method. The exposure coefficient parameters were set for the tube voltage of 80 kV, Field of View of 28 cm, slice thickness of 5 mm, and tube current time of 150 mAs, 200 mAs, and 250 mAs. Then, CT images in DICOM data format were processed using MicroDICOM Viewer software. The quality of the CT scan images was analysed based on the CT number value, noise level, and contrast resolution. The images of CeO2 nanoparticles have higher CT values, lower noise levels, and better contrast resolution than those of iodine contrast agents. The results show that the CT image results of CeO2 NPs have better quality than those of iodine-containing contrast agents.
Pengukuran Dosis Neutron untuk Keselamatan Pekerja Radiasi dan Masyarakat di Pusat Terapi Proton Kompak (CPTC) Menggunakan Kode Monte Carlo MCNP6.2 Kusuma, Annisa Dian; Triadyaksa, Pandji; Priyono, Priyono; Arianto, Fajar
Physics and Science Education Journal (PSEJ) Physics and Science Education Journal (PSEJ), Volume 5 Nomor 3, Desember 2025
Publisher : Physics Education Departement, Islamic State University Sulthan Thaha Saifuddin Jambi - Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30631/ad8wwq47

Abstract

This study aims to analyze the ambient equivalent dose H*(10) of neutrons and evaluate the effectiveness of radiation shielding at the Monte Carlo-based Compact Proton Therapy Center (CPTC) facility using Monte Carlo N -Particle (MCNP6.2) software with four variations in the direction of the proton beam (0°, 90°, 180°, 270°). The simulation was conducted to determine the effect of beam orientation on neutron radiation distribution in the area around the bunker, particularly in the Treatment Control Room (TCR) and door area. The simulation results showed that the dose distribution was highly dependent on the beam direction and the geometric configuration of the CPTC facility. The highest dose value was obtained from the 270° direction, which was 733 µSv/year. However, the dose is still below the dose limit set by the Nuclear Energy Regulatory Agency (BAPETEN), which is 1 mSv/year for the public, so the CPTC facility design is considered safe against secondary neutron exposure. This research contributes to the development of physics, particularly in the application of the Monte Carlo method for radiation protection analysis, and is expected to be a development asset for proton therapy in Indonesia.
Co-Authors Achmad Sjaifudin Tayibnapis Ali Khumaeni Asep Yoyo Wardaya Binu Soesanto, Qidir Maulana Budiman, Rizki Dhyan Prastiwi Evi Setiawati Fajar Arianto Fajar Ariyanto Hasan, Siti Nurjannah Heri Sutanto I Gusti Bagus Wiksuana Iis Nurhasanah J. Wasiq Jatmiko Endro Suseno Kusuma, Annisa Dian Mahendra Kusuma Nugraha Muchammad Azam, Muchammad Muhammad Adrian Lathif Muhammad Nur Muhammad Nur Nasrullah, Faiz Ningrum, Febri Sintia Priyono Priyono Priyono, Andi Rasito Tursinah, Rasito Rukmono, Dito Andi SRI RAHAYU Sumariyah Sumariyah Susilo Hadi Wienda Intan Permatasari Yusup Hidayat Zaenul Muhlisin