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Jurnal Fisika Unand
Published by Universitas Andalas
ISSN : 23028491     EISSN : 26862433     DOI : https://doi.org/10.25077/jfu
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Makalah yang dapat dipublikasikan dalam jurnal ini adalah makalah dalam bidang Fisika meliputi Fisika Atmosfir, Fisika Bumi, Fisika Intrumentasi, Fisika Material, Fisika Nuklir, Fisika Radiasi, Fisika Komputasi, Fisika Teori, Biofisika, ataupun bidang lain yang masih ada kaitannya dengan ilmu fisika.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 1,782 Documents
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Identifikasi Kualitas Udara di Sekitar PLTU Teluk Sepang, Kota Bengkulu Verojenases, Fascal; Angeli Silaban; Samuel Christian Alfredo Banjarnahor; Irkhos; Lizalidiawati
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.368-378.2025

Abstract

PLTU Teluk Sepang uses coal as the main fuel and has the potential to reduce air quality in the vicinity. This study aims to identify the air quality around PLTU Teluk Sepang and its impact on the environment and public health. The data used are PM2,5, PM10, CO, and CO2 at seven location points in June and July 2024. The method in this research is quantitative and descriptive, quantitative is used to compare the measurement results with the threshold set by the government, while descriptive is used to visualize the data in the form of graphs and distribution maps. The results showed that PM2,5 and PM10 levels at several points exceeded the specified thresholds, especially near the PLTU and traffic road areas, which fell into the “Unhealthy.” category. CO levels are still within safe limits, while CO2levels are in the polluted air category, and the increase in pollutants at night indicates a significant impact of PLTU activities on air quality. This study shows that the air quality around Teluk Sepang PLTU is in a polluted condition, so mitigation measures are needed to control air pollution for public health and the environment.
Analisis Korelasi Nilai Entrance Surface Air Kerma (ESAK) Terhadap Massa Tubuh, Usia, dan Faktor Eksposi pada Pasien Pemeriksaan Radiografi Umum di RSUP Dr. M. Djamil Padang Putri, Rahmiatul; Milvita, Dian; Pratama, Ida Bagus Gede Putra
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.413-420.2025

Abstract

Research on the correlation analysis of Entrance Surface Air Kerma (ESAK) values ​​on body mass, age and exposure factors in general radiography examination patients was carried out at RSUP Dr. M. Djamil Padang. Data collection was carried out on adult patients with body mass (50-70) kg and age over 15 years on examination of the abdomen, thorax and lumbar spine for 3 months with a total of 1,113 patients. The method used to determine correlation is simple linear correlation test analysis. The results of the study showed that the ESAK value had a fairly strong correlation with the patient's body mass with an rxy value = 0.25-0.4 except for the lumbar spine examination. The ESAK value has a fairly strong to strong correlation with the exposure factor (kV) with a value of rxy = 0.27-0.6 and has a strong to very strong correlation with the exposure factor (mAs) as indicated with a value of rxy = 0.45 -0.9, but has a very weak correlation with patient age with a value of rxy = 0.02-0.1 except for lateral thorax examination.
Green Synthesis Nanopartikel Tembaga (CuNP) Menggunakan Ekstrak Buah Naga Merah (Hylocereus polyrhizus) sebagai Aplikasi Lapisan Tipis Karim, Afdal; Mardiansyah, Dedi; Dahlan, Dahyunir
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.408-412.2025

Abstract

Copper nanoparticle (CuNP)-based thin films have great potential in various technological applications, such as electronics, catalysts, and sensors, due to their high conductivity value and enhanced surface reactivity. This study aims to fabricate CuNP-based thin films using the spraying method, which is known to be efficient for material deposition on substrates. In the spraying process, copper nanoparticles are sprayed on a transparent glass substrate and dried at room temperature to form a homogeneous thin layer. Characterization of the thin films using UV-Vis spectrophotometer to determine the energy band gap and transmittance value. The results of testing the energy band gap of copper nanoparticles with a ratio of 1, 2, 3, 4, and 5 amounted to 3.03 eV, 3.09 eV, 3.11 eV, 3.17 eV and 3.25 eV. Meanwhile, the transmittance test results show that the percentage of thin layer transmittance ranges from 20% to 90% with good crystal quality and a smaller energy band gap that has high electrical conductivity so that the thin layer produced has a decent quality to be applied to printed electronic devices.
Indonesia Rancang Bangun Alat Ukur Konsentrasi Rhodamin B Menggunakan Sensor TCS34725 Berbasis Arduino UNO pada Kerupuk Bewarna Zakhiah, Putri; Firmawati, Nini
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.401-407.2025

Abstract

Food safety is a critical aspect, particularly regarding the use of hazardous dyes such as Rhodamine B, which can cause liver damage and increase cancer risk if consumed excessively. This study developed a system to detect and measure the concentration of Rhodamine B in red crackers using the TCS34725 sensor. The system utilizes the sensor to measure the colour intensity of samples, which is processed using an Arduino UNO and displayed as RGB values that are converted into Rhodamine B concentrations. The detection results are displayed on an LCD (Liquid Crystal Display) screen and complemented with a buzzer as an alarm. Validation was conducted by comparing the system's measurements with a UV-Vis spectrometer across a wavelength range of 400 nm to 600 nm for 10 Rhodamine B concentration variations, ranging from 0.5 ppm to 5 ppm. Testing was also performed on 10 red cracker samples through an extraction process. The results showed that the system achieved an accuracy of 93.86%, with a maximum wavelength of 553 nm. Two samples were detected to contain Rhodamine B at concentrations of 4.98 ppm and 5.11 ppm, respectively. This system is effective as a practical and accurate tool for ensuring food safety.
Evaluasi Penerapan Proteksi Radiasi pada Ruangan dan Pekerja Radiasi di Instalasi Radiologi Rumah Sakit Universitas Andalas Rahmawati, Indy; Milvita, Dian; Hiswara, Eri
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.394-400.2025

Abstract

Research has been carried out regarding the evaluation of the application of radiation protection to rooms and radiation workers in the Radiology Installation at Andalas University Hospital. The aim of the research is to evaluate the radiation dose rate on the inside and outside walls of the room, evaluate the radiation dose rate received by radiation workers, and evaluate the completeness of the work area and radiation protection for radiation workers. Evaluation of the radiation dose rate on the radiation shield wall was carried out using the TLD-100 in the CT-Scan, conventional X-ray and dental rooms. Evaluation of the radiation dose rate received by radiation workers is carried out using the TLD badge worn by radiation workers. Evaluation of the completeness of the work area is carried out by directly observing the radiology room, then conducting interviews with radiation workers. The research results showed that the highest radiation dose rate was obtained in the CT-Scan room and the lowest was outside the dental room at the entrance, without exceeding the Dose Limit Value (NBD) set by BAPETEN Regulation No. 4 of 2013 of 20 mSv/year for radiation workers and 1 mSv/year for the general public. The radiation dose rate value received by radiation workers is still below the NBD set by BAPETEN Regulation No. 4 of 2013 amounting to 20 mSv/year. The results of the evaluation of the completeness of the work area and radiation protection in general have met the provisions of BAPETEN Regulation No. 4 of 2020 except for danger signs in conventional X-ray and CT-Scan rooms.
Desain Pengiriman Data Gambar Menggunakan Gelombang Cahaya Tampak dengan Sel Surya Sebagai Detektor Cahaya Wahid, Rendy M.; Ariani, Menik; Adnan, Assaidah
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.387-393.2025

Abstract

Visible Light Communication research that sends image data has not been widely published. Therefore, it is necessary to conduct an experiment on sending image data from a camera connected to an Arduino where the module process is run. In this study, image transmission uses pulse-width-modulation (PWM), namely 2-PWM and 4-PWM. On the transmitter side, it consists of an OV2640 camera sensor, laser and Arduino Uno R3 while on the receiver side it consists of a solar panel and Arduino Uno R3. A push button is used as a trigger to take a picture by the camera; the image file will be converted by Arduino into binary; the binary will be modulated by the frequency of the red laser that emits pulses to the solar panel. The solar panel will forward the signal to Arduino to be modulated back into the original binary. Binary data will be processed into image data back offline using a computer. The system can work at a maximum distance of 8 m when using the 2-PWM module technique and a maximum of 6 m when using 4-PWM. The size of the system performance is calculated from the bit-error-ratio (BER) value based on the binary data received at the receiver.
Sintesis Surfaktan Natrium Lignosulfonat (C20H24Na2O10S2) Berbahan Dasar Serbuk Kayu Mahoni Menggunakan Proses Sulfonasi. Maulida, Nabilah; Aisah; Perwitasari, Dyah Suci; Siswati, Nana Dyah; Sani
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.421-427.2025

Abstract

Furniture production made from mahogany wood produces sawdust that contains biomass such as cellulose, hemicellulose, and lignin. The lignin content in mahogany wood can be used as raw material for making sodium lignosulfonate surfactants. Delignification of lignin is carried out alkaline and continued with lignin isolation by acid precipitation. Pure lignin isolate is further used as a raw material for making sodium lignosulfonate surfactants using the sulfonation process. The sulfonation process is carried out by mixing lignin isolate and sodium bisulfite solution using excess NaHSO3 variation and sulfonation time. Both variables are run by adding sodium hydroxide as a catalyst and the pH condition was maintained at pH 4. The sodium lignosulfonate surfactant solution formed was then characterized using FT-IR spectrophotometer and UV-Vis spectrophotometer. The best condition was obtained at a sulfonation time of 150 minutes and NaHSO3 exceeded 75%, namely with a surfactant concentration of   4100,784 mg/L.
pengukuran aktivitas spesifik 226Ra, 232Th dan 40K dalam air sungai Hulu Gadut menggunakan spektrometer gamma Yudayanti, Ila Yudayanti; Milvita, Dian; Kusdiana, Kusdiana
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.466-470.2025

Abstract

Research has been carried out on determining the specific activity 226Ra, 232Th and 40K in river water using gamma spectrometer. This study aims to determine the specific activities in river water hulu gadut, which were then reviewed based on the PERKA BAPETEN No. 9 of 2009. The samples were collected from 3 location, then were prepared by steamed and covered for 30 days, then measured using gamma spectrometer for 17 hours. The results of measurement of specific activities that exist 226Ra is (0,47±0,36) Bq/Kg, at 232Th is (2,15±0,36) Bq/Kg. and 40K is (0,43±0,38) Bq/Kg. Based on the head of PERKA BAPETEN regulation No. 9/2009, the specific activity of radionuclide in river water Hulu Gadut is currently below the limit which are 1000 Bq/kg for 226Ra, 232Th and for 40K 10000 Bq/kg. Based on the data obtained it was concluded that, river water Hulu Gadut is still safe and meets the requirements of quality standards.
Bahasa Indonesia Identifikasi Pencemaran Logam Berat pada Sedimen Sungai Banda Bakali Kota Padang Berdasarkan Nilai Suseptibilitas Magnetik Humairah, Nada Fitrati; Afdal, Afdal
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.493-499.2025

Abstract

A magnetic susceptibility analysis of sediments in the Banda Bakali River in Padang City has been conducted. Sampling was carried out at 48 points spread across the river's upstream, middle, and downstream areas at a depth of 10 cm, covering the river's left, middle, and right banks. The low-frequency magnetic susceptibility values of the samples, χlf of the sediment, ranged from 929.0×10-8 kg-1m3 to 5284.5×10-8 kg-1m3, indicating a moderate pollution level. Comparison of χlf values between river sections showed higher pollution concentrations in the riverbanks compared to the middle section. χlf values in the upstream area were relatively lower than those in the middle and downstream areas, which were influenced by increased anthropogenic activities downstream. Analysis of the superparamagnetic grain fraction based on frequency-dependent magnetic susceptibility values (χfd) indicated the dominance of magnetic particles from anthropogenic sources, mainly domestic and industrial waste. These findings confirm that magnetic susceptibility is an effective method for monitoring sediment quality and identifying the impact of human activities on heavy metal pollution in the Banda Bakali River.
Penentuan Aktivitas Spesifik Radionuklida Alam Pada Udara Dan Laju Dosis Efektif Radiasi Gamma Di Kawasan BPTU-HPT Padang Mengatas Sumatera Barat Novita, Rahmi; Milvita, Dian; Suhariyono, Gatot; Kusdiana, Kusdiana; Hidayat, Maulidia
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.479-485.2025

Abstract

The measurement of the radionuclides activity in an area contributes to monitor the environment, radiation safety and the public health. The specific activity of natural radionuclides in the air and the effective dose rate of gamma radiation in the air have been determined at the Center of Superior Livestock Breeding and Forage Animal Feed (BPTU-HPT) in Padang Mengatas, West Sumatra. The samples of the radionuclides were acquired by using the High-Volume Air Sampler (HVAS) at 6 different locations for 60 minutes, then they were prepared for 30 days and subsequently counted by utilizing a pre-calibrated gamma spectrometer for 17 hours. Furthermore, the measurement of the gamma radiation dose rate was carried out at all defined locations using a survey meter.  The results show that the specific activity values ​​of natural radionuclides differ each location point. The specific activity values ​​of Th-232 and U-238 were not detected at all sampling locations. Furthermore, the specific activity values of Ra-226 at location points 4 and 5, and Th-228 at location point 5 are above the threshold set by PERKA BAPETEN. No. 16 of 2013, namely 0.05 Bq/m3 and 0.003 Bq/m3. The effective dose rates of gamma radiation obtained at all sampling locations were below the threshold set by PERKA BAPETEN No. 16 of 2013, which is 1 mSv/year

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