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Ali Khumaeni
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Journal of Physics and Its Applications
Published by Universitas Diponegoro
ISSN : -     EISSN : 26225956     DOI : 10.14710
Core Subject : Science,
Astronomy Earth & Planetary Sciences Materials Science & Nanotechnology Physics
Journal of Physics and Its Applications (JPA) (e-ISSN: 2622-5956) is open access, International peer-reviewed journal that publishes high-novelty and original research papers and review papers in the field of physics including Radiation Physics, Materials, Geophysics, Theoretical Physics, Instrumentation and Electronics, Medical Physics, Biomedical Physics, Chemical Physics, Mathematical Physics, and Applied Physics. The JPA publishes two issues annually (May and November). The journal is published by Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Indonesia.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 7, No 1 (2024): November 2024" : 5 Documents clear
Analysis of Total Proton Therapy Dose Distribution with Pencil Beam Collimator Model and Varied Beam Directions in Craniopharyngioma Tumor using MCNP6 Software Hayati, Widia; Utari, Utari; Anwar, Fuad; Suharyana, Suharyana; Arianto, Fajar; Khakim, Azizul
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.23977

Abstract

Proton therapy modeling for treating craniopharyngioma tumors was conducted using a pencil beam collimator, and variations in beam directions were performed using MCNP6 software. The simulation was carried out on a head and neck phantom with the tumor cells modeled within a cubic irradiation area geometry with a 1.2 cm side length, divided into 27 small cubic voxels with a small voxel side length of 0.4 cm. The radiation source from the irradiation area's right, left, and top directions, with a diameter of 0.4 cm, was directed at each cubic voxel. Variation in radiation source directions indicated that irradiation from the right direction of the irradiation area is the most recommended approach, with a dose uniformity level of 83.47%. Healthy organs surrounding the irradiation area received lower doses than those obtained by tumor cells, and the majority remained below the Organ At Risk (OAR) threshold. Healthy organs received the highest dose, particularly in the brain region, at a relative 0.46% compared to the total dose received by tumor cells.
Verification of Co-60 Source in Brachytherapy Equipment Using TW33005 Well-Type Chamber Hemelia, Junita; Wardani, Pratiwi Sri; Intifadhah, Sahara Hamas; Zarkasi, Ahmad; Putri, Devina Rayzy Perwitasari Sutaji
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.24100

Abstract

Accidents in brachytherapy have occurred and are documented by the IAEA. These incidents are attributed to various factors, such as inaccurate sources, lack of independent verification, and equipment failures due to inadequate calibration. Verifying radioactive sources is crucial for ensuring patient safety. Verification is conducted to confirm that the measured source activity is accurate and stable. Accuracy and stability of source activity are two essential parameters in verification. Source activity accuracy indicates how closely the measured source activity aligns with the reference source activity, while source activity stability reflects the well-type chamber's ability to produce consistent results over time. This study aimed to verify the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital using a TW33005 well-type chamber and analyze the results against national and international standards. The results showed that the Co-60 source activity values remained accurate and stable over five months. The highest accuracy was observed in November 2023 (-2.011%), while the lowest was in October 2023 (-2.397%). The highest stability was recorded in September 2023 (-0.416%), and the lowest in October 2023 (-2.090%). In conclusion, the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital met the accuracy standards set by ESTRO and BAPETEN of 3% to 5% and the stability standard set by the IAEA of ±3%. This indicates that the sources are safe for use in brachytherapy.
The Influence of Capillary Pressure on Permeability in Rock Samples Using the Mercury Injection Capillary Pressure (MICP) Method Nugroho, Nurkhozin Adhi; Agriandita, Isnani; Yuda, Farhan Bintang
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.24438

Abstract

The Mercury Injection Capillary Pressure (MICP) method to measure capillary pressure has become a crucial technique for characterizing the porosity and permeability of reservoir rocks. This study aims to assess the impact of capillary pressure on the permeability of two rock samples from the Bangko and Telisa formations in the Central Sumatra basin. Measurements were conducted utilizing the Autopore V 9600 instrument, which employed mercury as the injected fluid into the two rock samples, under pressures reaching up to 60,000 psi. These pressures are classified as capillary pressure. The data obtained were analyzed through Drainage curves to elucidate the relationship between capillary pressure and permeability. The results derived from the Drainage curves indicate that the A1 rock sample from the Bangko formation has medium permeability, with displacement pressure (Pd) of 10.4871 psi. In comparison, the A2 sample from the Telisa formation has low permeability with Pd of 516.6259 psi. The increase in capillary pressure resulted in a decrease in water saturation and an increase in the intrusion of the non-wetting fluid (mercury), particularly in samples with better permeability. This finding suggests that lower Pd values indicate better pore connectivity, which correlates with increased permeability. Highlights that the MICP method provides profound insights into the relationship between capillary pressure and the ability of rocks to transmit fluids, as well as the significance of pore geometry and distribution in influencing the permeability characteristics of reservoir rocks.
Probabilistic Analysis of Hazard Soil Movement Based on Maximum Ground Acceleration Spectrum Patterns Due to the Malang Raya Earthquake Marbun, Yorgita Naully; Basid, Abdul; Ilham, Ilham; Ginting, Rika Adelina; Sunardi, Bambang
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.24545

Abstract

Earthquakes occur when tectonic plates beneath the earth's surface shift due to pressure accumulated in rocks, releasing kinetic energy and causing earthquake waves. This study analyzes the potential risk of earthquake hazards using the Probabilistic Seismic Hazard Analysis (PSHA) method which is based on the calculation of the probability of earthquake occurrence and vibration intensity using data from 3 sources of subduction earthquakes, faults and background earthquake sources in the Malang Raya research area which is geographically located in the Indonesian archipelago with an active collision zone of the Indo-Australian plate with the Eurasian plate. Research processing uses Zmap and R Crisis software. The results of the study show that peak ground acceleration has a value on the bedrock ranging from 0.169 g to 0.255 g. The ground acceleration spectrum at T = 0.2 seconds ranges from 0.288 g to 0.464 g, while at T = 1 second ranges from 0.150 g to 0.275 g. The distribution of PGAm values on the surface ranges from 0.174 g to 0.273 g, and the ground acceleration spectrum at T = 0.2 seconds ranges from 0.302g to 0.551g, while at T = 1 second it ranges from 0.151 g to 0.284 g. The area that shows the highest earthquake vulnerability value is around the southern coast of Malang Raya because it is close to the earthquake source. The northern region experiences an increase in the acceleration spectrum value due to its proximity to the source of the fault earthquake and several other geophysical factors.
Verification of Gamma Knife Output Dose Conformity with Treatment Planning System in Terms of Red, Green, and Blue Channels Wijaya, Tabitha Ivana; Irhas, Irhas; Soediatmoko, Elia; Manik, Josua Timotius
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.22506

Abstract

The calibration method using Gafchromic EBT-3 film is employed to verify the conformity of the Gamma Knife output dose compared to the Treatment Planning System (TPS). The films undergo exposure to doses of 5, 10, 15, 20, and 25 Gy on a phantom, followed by data processing and analysis using ImageJ, MatLab, and Microsoft Excel software. Assessment of the red, green, and blue channels is carried out to evaluate their sensitivity and conformity with the TPS doses. The film calibration curve shows that the red channel has the highest sensitivity among the other two channels, as indicated by the corresponding increase between dose and net Optical Density (OD). Calculation of the gamma index using Dose Difference (DD) and Distance to Agreement (DTA) values at 3% and 2.4 mm were used to determine the conformity of the film dose with TPS using the Gamma Passing Rate (GPR). The red, green, and blue channels obtained GPR values of 98.96%, 98.61%, and 98.27%, respectively. This result validates that the red channel achieved the highest percentage of conformity between film and TPS doses. However, the GPR values of the three channels have no significant difference. It is concluded that the red, green, and blue channels have a high percentage of conformity between the film dose and the TPS dose.

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