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All Journal Jurnal Ilmiah Aplikasi Isotop Radiasi Panrita Abdi - Jurnal Pengabdian pada Masyarakat BULETIN FISIKA Jurnal Sains dan Pendidikan Fisika
Syamsir Dewang
Universitas Hasanuddin
Astronomy Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Energy Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Physics Other

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Experimental Study of Concrete Composites of Fly Ash and Ferronickel Slag for Gamma-Ray Shielding Patrick Marcelino Wongso; Syamsir Dewang; Eko Budi Jumpeno; Okky Agassy Firmansyah; June Mellawati
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 16, No 1 (2020): JUNI 2020
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2020.16.1.5800

Abstract

This study aim is to determine the effect of partial replacement of cement by high percentages of fly ash and ferronickel slag as gamma radiation shielding properties of concrete. The percentages of replacement were 30% for fly ash and 10%, 20%, and 30% for ferronickel slag by weight of fine aggregate. Several physical parameters (linear attenuation coefficients, mass attenuation coefficients, half value layer, tenth value layer, mean free path, effective atomic number, and effective electron density) of concretes were measured using 600cc Thin Window Ionization Chamber. A broad beam transmission geometry method with 137Cs source was used for the radiation intensity measurements. The elemental compositions of the concretes were analyzed by using an energy dispersive X-ray Fluorescence Spectrometer (EDXRF). In this experiment, the concrete composite sample with composition of 0% fly ash and 30% ferronickel slag shows the most effective result in absorbing low energy gamma rays, therefore it has the potential as a candidate for gamma radiation shielding.
PELATIHAN PEMBUATAN PAPAN IKLAN DOT-MATRIKS BERBASIS MIKROKONTROLER DI SMKN 1 WAJO A. Arifin; Ida Laila; Muqoil Darussalam; Nurlindah Hamrun; Dahlang Tahir; Syamsir Dewang
Panrita Abdi - Jurnal Pengabdian pada Masyarakat Vol. 5 No. 3 (2021): Jurnal Panrita Abdi - Juli 2021
Publisher : LP2M Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/pa.v5i3.11254

Abstract

Technological development in the manufacture of microcontroller-based dot-matrix billboards carried out in the form of counseling and training for students at Wajo 1 State Vocational High School (SMK). The implementation of this training aims to increase the insight, knowledge, and skills of vocational school students, which are an educational level that must have different knowledge from the level of education in general. The method of implementing this activity includes site observation, preparation, counseling, and provision of materials related to physics and energy, entrepreneurship, optoelectronic technology, as well as the implementation of training on making Arduino microcontroller-based dot-matrix billboards and evaluating the training implementation. The result of this activity is an increase in the knowledge and insight of students in terms of making a series of dot-matrix billboards using electronic components, understanding program code, running the Arduino Integrated Development Environment (IDE) program, conducting simulations on circuits using the Arduino microcontroller and students have successfully demonstrated and run the running text panel that was created using an Android smartphone. --- Pengembangan teknologi dalam pembuatan papan iklan dot-matriks berbasis mikrokontroler yang dilakukan dalam bentuk penyuluhan dan pelatihan kepada siswa-siswi di Sekolah Menengah Kejuruan (SMK) Negeri 1 Wajo . Pelaksanaan pelatihan ini bertujuan untuk meningkatkan wawasan, pengetahuan dan keterampilan siswa-siswi SMK yang merupakan tingkat pendidikan yang harus memiliki pengetahuan yang berbeda dari tingkat pendidikan pada umumnya. Metode pelaksanaan kegiatan ini meliputi peninjauan lokasi, persiapan, penyuluhan dan pemberian materi terkait fisika dan energi, kewirausahaan, teknologi opto-elektronika, serta pelaksanaan pelatihan pembuatan papan iklan dot-matriks berbasis mikrokontroler arduino dan evaluasi pelaksanaan pelatihan. Hasil dari kegiatan ini adalah adanya peningkatkan pengetahuan serta wawasan siswa dalam hal pembuatan rangkaian papan iklan dot-matriks menggunakan komponen elektronika, memahami kode program, menjalankan program arduino Integrated Developement Environment (IDE), melakukan simulasi pada rangkaian menggunakan mikrokontroler arduino serta siswa telah berhasil mendemonstrasikan dan menjalankan panel running text yang telah dibuat dengan menggunakan smartphone android.  
Determination of Cardiothoracic Ratio (CTR) and Image Contrast in Chest Radiographs Using Variations in Focus-Film Distance (FFD) Fickry Haikal; Sri Dewi Astuty; Sultan Hamjar; Syamsir Dewang; Bannu Bannu; Arfinna Arfinna; Ayu Hardianti Pratiwi; Ajeng Anggreny Ibrahim
BULETIN FISIKA Vol. 27 No. 2 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i02.p13

Abstract

Posteroanterior (PA) chest radiography is generally recommended at a focus-to-film distance (FFD) of 180 cm to minimize magnification of the cardiac silhouette, which may affect assessment of cardiomegaly. However, shorter FFDs are sometimes unavoidable because of room constraints or patient-related conditions. This study aimed to evaluate cardiothoracic ratio (CTR) values obtained at different FFDs and assess cardiac image quality using the contrast-to-noise ratio (CNR) to determine the visibility of the right and left cardiac borders. A descriptive observational study with a post-test-only design was conducted using 70 digital PA chest radiographs from male patients aged 17–22 years. The images were divided into seven FFD groups ranging from 120 to 180 cm, with 10 independent samples per group. CTR and CNR were quantitatively measured using ImageJ software. All radiographs demonstrated CTR values below 50% across the investigated FFDs, indicating no radiographic evidence of cardiomegaly. The highest mean CNR values were observed at FFDs of 140 cm (64.458), 150 cm (58.639), and 180 cm (50.758). Statistical analysis revealed no significant differences in CTR (p = 0.515) or CNR (p = 0.141) among the FFD groups. The observed fluctuations in CTR and CNR were likely attributable to inter-individual anatomical variation rather than FFD-related magnification. Differences in chest geometry and tissue attenuation, particularly variations in thoracic thickness and density, may have contributed substantially to the observed measurements. These findings suggest that, within the investigated range, FFD variations from 120 to 180 cm did not significantly affect CTR or CNR in young adult male subjects.
PENGARUH LUAS KOLIMASI DAN KETEBALAN PHANTOM ANSI TERHADAP NILAI EXPOSURE INDEX DAN DOSE AREA PRODUCT DALAM PEMERIKSAAN DIGITAL RU Patra Susantri; Sri Dewi Astuty; Siti Hartina; Aandri; Syamsir Dewang; Ayu Hardianti Pratiwi; Arfinna; Ajeng Anggreny Ibrahim
Jurnal Sains dan Pendidikan Fisika Vol. 22 No. 2 (2026): JURNAL SAINS DAN PENDIDIKAN FISIKA
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/jspf.v22i2.11741

Abstract

Radiografi umum merupakan modalitas diagnostik yang paling sering digunakan sehingga perlu dilakukan Quality Control yang lebih optimal. Salah satu parameter yang dapat diuji adalah Exposure Index (EI) dan Dose Area Product (DAP) karena akan menentukan ketepatan penyinaran untuk menjamin keselamatan radiasi terutama bagi pasien. Penelitian ini bertujuan menganalisis pengaruh variasi luas kolimasi dan ketebalan terhadap nilai EI dan DAP menggunakan phantom tiruan standar American National Standards Institute (ANSI) dengan pilihan jenis pemeriksaan lumbar. Analisis menggunakan uji statistik yaitu regresi linier berganda untuk melihat pengaruh variabel type pemeriksaan, tebal phantom dan atau luas kolimasi terhadap nilai EI dan DAP dengan metode uji koefisien determinasi dan uji FIT secara simultan. Hasil yang paling besar pengaruhnya adalah variabel tebal phantom dan luas kolimasi dengan nilai maksimum untuk EI dan DAP berturut-turut sebesar 276 (pada kondisi type Large, tebal 10cm, luas 30x30) dan 233 mGy/m2 (pada kondisi type Large, tebal 20cm, luas 40x45). Uji FIT paling signifikan pengaruhnya untuk nilai EI adalah type pemeriksaan yang otomatis menyesuaikan faktor eksposi terutama tegangan, sedangkan untuk nilai DAP sangat dipengaruhi oleh tebal phantom dan luas kolimasi karena generator tabung akan memproduksi dosis sinar X berdasarkan luas kolimasi. Profil nilai EI dan DAP untuk obyek pasien diperoleh nilai EI dan DAP maksimum masing-masing 255 dan 254 mGy/m2. Penelitian ini menegaskan pentingnya pengaturan kolimasi dan ketebalan objek dalam menjaga keseimbangan antara kualitas citra dan keselamatan radiasi pasien. Kata kunci: Dose Area Product, Exposure Index, Phantom ANSI  General radiography is the most frequently used diagnostic modality, so it is necessary to conduct more optimal Quality Control. One of the parameters that can be tested is the Exposure Index (EI) and Dose Area Product (DAP) because it will determine the accuracy of irradiation to ensure radiation safety, especially for patients. This study aims to analyze the effect of variations in collimation area and thickness on EI and DAP values ​​using a standard American National Standards Institute (ANSI) phantom with a choice of lumbar examination types. The analysis uses statistical tests, namely multiple linear regression to see the effect of examination type variables, phantom thickness and/or collimation area on EI and DAP values ​​with the coefficient of determination test method and FIT test simultaneously. The results with the greatest influence are the variables of phantom thickness and collimation area with maximum values ​​for EI and DAP respectively of 276 (in the large type, 10cm thick, 30x30 area) and 233 mGy/m2 (in the large type, 20cm thick, 40x45 area). The FIT test that has the most significant influence on the EI value is the type of examination that automatically adjusts the exposure factors, especially voltage, while the DAP value is greatly influenced by the phantom thickness and collimation area because the tube generator will produce an X-ray dose based on the collimation area. The EI and DAP value profiles for patient objects obtained maximum EI and DAP values ​​of 255 and 254 mGy/m2, respectively. This study emphasizes the importance of adjusting collimation and object thickness in maintaining a balance between image quality and patient radiation safety. Keywords: Dose Area Product, Exposure Index, Phantom ANSI
Co-Authors A. Arifin Aandri Ajeng Anggreny Ibrahim Arfinna Arfinna Arfinna Ayu Hardianti Pratiwi Bannu Bannu Dahlang Tahir Eko Budi Jumpeno Fickry Haikal Ida Laila June Mellawati Muqoil Darussalam Nurlindah Hamrun Okky Agassy Firmansyah Patra Susantri Patrick Marcelino Wongso Siti Hartina Sri Dewi Astuty Sri Dewi Astuty Ilyas Sultan Hamjar