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Ali Khumaeni
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khumaeni@fisika.fsm.undip.ac.id
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Department of Physics Faculty of Science and Mathematics Diponegoro University Jl Prof Soedharto SH, Tembalang, Semarang, Indonesia
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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 6 Documents
 1 
Search results for , issue "Vol 6, No 2 (2024): May 2024" : 6 Documents clear
Investigation of Radiation Protection Measures in Extracorporeal Shock Wave Lithotripsy Facilities: A Study Based on NCRP Report 147 Margaretha, Angelica; Adhianto, Dwi; Manik, Josua Timotius
Journal of Physics and Its Applications Vol 6, No 2 (2024): May 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/elipsoida.%Y.22518

Abstract

Fluoroscopy, also referred to as the C-Arm, is a direct imaging modality used in interventional radiology. It is commonly used, particularly in Extracorporeal Shockwave Lithotripsy (ESWL) for kidney stone removal. The process of kidney stone destruction typically spans from 45 to 60 minutes. Continuous exposure to the radiation can lead to an accumulation of radiation dosage, potentially causing harmful effects. Radiation shielding is one of the most important factors for radiation protection in obtaining a license to construct a radiation room. Radiation shielding requires a minimum thickness to prevent exposure to radiation from escaping the room and posing a risk to the public. Measurements were conducted within the ESWL facility situated at XYZ private hospital, encompassing both internal and external locations, spanning across a total of 11 designated measurement points. The calculations were performed in accordance with the guidelines stated in NCRP Report No.147. The result obtained were 1.665; 1.681; 1.686; 1.109; and 1.716 mm for lead material thickness and 223.8; 225.9; 226.4; 153.2; and 230.2 mm for concrete material thickness. The hospital walls were constructed using concrete with a thickness of 200 mm and were additionally covered with a 2 mm Pb coating. In conclusion, the lead installed meets NCRP standards, but the thickness of the concrete walls around the room still falls short of the requirements.
Study of Light Pollution Characteristics in Berau with Sky ‎Quality Meter Bayyinah, Rahmatul; Pramudya, Yudhiakto
Journal of Physics and Its Applications Vol 6, No 2 (2024): May 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v6i2.20112

Abstract

The quality of night sky conditions can affect the results of astronomical ‎observations and ‎the ‎survival of wildlife, one of which is sea turtles. One of the causes of the ‎declining quality of ‎the night ‎sky is light pollution. To identify a location's light pollution ‎levels and the quality ‎of the night sky, it ‎is possible to measure the night sky brightness with ‎the Sky Quality ‎Meter (SQM). This ‎research specifically focuses on assessing night sky conditions in Berau, an important sea turtle conservation area, through analysis of SQM. By conducting observation through the period May-July 2022, covering each of the different moon phase, the objectives of this research to quantify the brightness of the night sky in Berau, measured in magnitude per arc square (‎mag/arcsec2) to describe the characteristics of light pollution in Berau and interpreted on the Naked Eye Limiting Magnitude (NELM) scale and the Bortle scale. Based ‎on the research results, ‎the highest frequency probability distribution was ‎observed from the ‎value of the sky brightness ‎level measured using SQM in Berau, with the ‎highest value ‎obtained at the new moon phase, 19.60 ‎mag/arcsec2, the conversion value in ‎NELM being ‎‎4.68, and in the Bortle scale, grade 7 with the ‎suburban transition category. ‎And for the ‎lowest value obtained at the time of the full moon ‎phase, 16.66 mag/arcsec2 with ‎a ‎conversion value in NELM of 2.26, and on the Bortle scale, it is in ‎class 9 with the ‎category ‎of the inner-city sky.‎
Characterization of Optical Properties of Colloidal Gold Solution based on Changes in Concentration using Light Polarization Method Winarno, Winarno; Firdausi, Ketut Sofjan; Soesanto, Qidir Maulana Binu; Khumaeni, Ali
Journal of Physics and Its Applications Vol 6, No 2 (2024): May 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v6i2.22406

Abstract

This research was conducted to determine the effect of concentration on the characteristics of changes in the polarization angle of colloidal gold solutions. The method used in this research is natural polarization. The light source used was a green laser with a wavelength of 532 nm. The colloidal gold solution was obtained using the laser ablation method and then dissolved in aquabidest. The characteristics of changes in the angle of light polarization in the gold colloidal solution were obtained by varying the concentration of the gold colloidal solution (40 ppm, 30 ppm, 20 ppm, and 10 ppm). The results showed that gold colloids have optical activity because the orientation of the gold colloid molecules allows them to interact asymmetrically with linearly polarized light. In the range of concentration from 10 to 40 ppm, the polarization angle in gold colloids shows a linear pattern as a function of concentration. Within one month the colloidal gold sample showed stable properties. This method allows us to further analyze the quality of other types of colloids using the same method. This will improve our understanding of the interaction of polarized light with nanoparticles.
Five-Year Analysis of Measured and Calculated Dose Rates from Co60 Teletherapy Machine at Centre for Nuclear Medicine and Radiotherapy (CENAR) Quetta, Pakistan: A Comprehensive Assessment Shafiq, Sunnia; Ahmad, Hafiz Khush Naseeb; Manzoor, Hina; Ur-Rehman, Awais; Naheed, Hameeda; Kanwal, Shagufta; Basit, Abdul; Ullah, Sadiq; Saeed, Hashir; Iftikhar, Shehla
Journal of Physics and Its Applications Vol 6, No 2 (2024): May 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v6i2.21791

Abstract

This study assesses the dosimetry of a Cobalt-60 (Co60) teletherapy unit at the Centre for Nuclear Medicine and Radiotherapy (CENAR), Quetta, to ensure consistent radiation doses for cancer management. Dosimetry measurements were compared against expected outputs derived from the International Atomic Energy Agency's TRS-398 protocol and decay calculations. The current investigation demonstrates uniformity in average output (dose rate) between the actual dosimetry values and the anticipated output values obtained through the International Atomic Energy Agency's TRS-398 (2000) protocol and decay method respectively. The actual dosimetry values fall within a range of ±2% of the estimated values. The difference in measurements acquired through the two approaches falls within acceptable limits as per recommended protocols. Consequently, our study reveals a steady pattern in dose rate, ensuring improved patient dose distribution and minimizing the risk of over or under-dosage.
PGA Estimation of 346 Points in West Sumatra based on Earthquakes Scenario in West Pasaman with Si and Midorikawa Formula Ramadhan, Wahyu; Syafriani, Syafriani; Fauzi, Ahmad; Dwiridal, Letmi
Journal of Physics and Its Applications Vol 6, No 2 (2024): May 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v6i2.20795

Abstract

There was a destructive earthquake on February 25, 2022, at 08:39:29 WIB with a magnitude of 6,1 Mw that struck western Sumatra with an epicenter on land, and was located on a blind fault. The impact of the earthquake was felt quite widely in all Regencies/Cities in West Sumatra with an intensity of IV – VIII MMI. The earthquake caused damage, an estimated 6627 houses, 70 mosques, 41 offices, 208 schools, 25 medical infrastructure and 5 bridges. Therefore, it is necessary to conduct research in the province of West Sumatra on PGA using the Si and Midorikawa method and intensity with Murphy O'Brein's empirical formulation as an effort to mitigate earthquake disasters. This study aims to determine PGA as the level of earthquake activity and intensity as a measure of the damage caused by earthquakes and to analyze their distribution maps. The data used is earthquake data for the period 1936-2022 with a magnitude ≥ 5 Mw and a depth of ≤ 70 km sourced from the catalog of the National Earthquakes Information Center U.S Geological Survey (NEIC/USGS). The results of data processing produce PGA values in West Sumatra ranging from 0.4083 – 782.9839 gal with an intensity (MMI) ranging from I – IX MMI. Map of distribution of PGA values and the highest intensity is in West Pasaman Regency and the lowest value is in Mentawai Islands Regency. The West Pasaman Regency area and its surroundings should meet the requirements for earthquake-resistant buildings, because they have a fairly high PGA value.
Applications of Gravity Method Based on Satellite Image Anomaly Data to Identify Subsurface Structures Althafunnisa, Namyra Aisha; Herbianto, Sheren Aurellya; Setyawan, Agus
Journal of Physics and Its Applications Vol 6, No 2 (2024): May 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v6i2.21636

Abstract

We have reviewed several research related to the estimation of subsurface structure on several area in Indonesia using gravity method based on satellite image. There are located in Semarang City, Mount Tandikat, Mount Muria, Majene Earthquake Affected Area, and Mount Merapi-Merbabu. The aim of this literature study is to determine the accuracy of satellite gravity data to identify and model subsurface structures by testing them in several cases. Data processing was carried out starting from the free air anomaly and then field correction was carried out to obtain the Bouguer anomaly. Moreover, different advanced processing is carried out, such as gradient analysis, 2D and 3D modeling. The software used includes GRAV2DC, Gravblox, Bloxer, and Grav3D.The results show variations in rock density and subsurface structure at each location. Subsurface modeling includes rock types, faults and basins that can help understand local geology. The study also shows estimates of the thickness of the sediment layers at several research locations. The research results show variations in rock density in various locations (granite, sandstone, andesite, mudstone) with different density values (between 1 g/cm³ to 2.9 g/cm³). Generally, gravity data from satellite images can provide subsurface information such as lithology, geological potential, the presence of hydrothermal pathways and structures. Regarding the type of fault, it is necessary to carry out geological observations in the field and cannot just rely on the results of gravity modeling. Furthermore, the results of gravity mapping will play an important role in disaster risk management and understanding geodynamics in the area studied.

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