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All Journal POSITRON Komunikasi Fisika Indonesia JURNAL FISIKA JOURNAL ONLINE OF PHYSICS Jurnal Fisika FLUX Journal of Physics and Its Applications Jurnal Ilmu Fisika Jurnal Pendidikan Fisika dan Teknologi Indonesian Physical Review Jurnal Teori dan Aplikasi Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Journal of Experimental and Applied Physics
Yani, Sitti
Department Of Physics, Faculty Of Mathematics And Natural Sciences, IPB University Jalan Meranti Kampus IPB Dramaga, Bogor 16680
Astronomy Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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ANALISA DISTRIBUSI DOSIS PADA FANTOM HOMOGEN DAN INHOMOGEN DENGAN SIMULASI MONTE CARLO Sitti Yani
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.39-44

Abstract

Monte Carlo simulation with electron gamma shower (EGSnrc) code can produce 3-dimensional dose distribution data. The percent depth dose curve (PDD), dose profile, and isodose curve can be extracted through this 3-dimensional data. In this study, a photon source with an energy of 2 MeV is placed at the source to surface distance (SSD) from the phantom surface by adjusting the collimator aperture which is used to control the size of the exposure field. The SSD distance was varied at a distance of 50 cm, 70 cm, 80 cm, 90 cm, and 100 cm. The size of the exposure area is also varied by 2 × 2 cm2, 5 × 5 cm2, 7 × 7 cm2, and 10 × 10 cm2. The dose distribution analysis was carried out on homogeneous phantoms containing water and inhomogeneous phantoms containing tissue/bone/lung/bone/tissue material. The PDD curve and dose profile represent dose changes with depth and x or y direction, respectively. The PDD curve on a homogeneous phantom shows an increase in the value on the surface of the phantom to the depth with the maximum dose. This curve then decreases gradually with increasing depth. Inhomogeneous ghosts show spikes in the border region of the two media with different densities. This is due to the contribution of the backscattered electrons generated by the bone media and into the tissue media. This phenomenon is also seen in the isodose curve for inhomogeneous phantoms.
Electron contamination for 6 MV photon beams from an Elekta linac: Monte Carlo simulation Choirul Anam; Djarwani S Soejoko; Freddy Haryanto; Sitti Yani; Geoff Dougherty
Journal of Physics and Its Applications Vol 2, No 2 (2020): May 2020
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v2i2.7771

Abstract

In external beam radiotherapy, the photons from a linear accelerator (linac) machine undergo multiple interactions, not only in the patient but also in the linac head and the air column between the linac head and the patient. Electrons are released from these interactions and contaminate the beams. The current study evaluates electron contamination for 6 MV photon beams from an Elekta linac using Monte Carlo simulation. The linac head was simulated by the BEAMnrc code and the absorbed dose in a phantom was calculated using the DOSXYZnrc code. The parameters of the initial electron beams on the target, such as mean energy and radial intensity distribution, were determined by matching the calculated dose distributions with the measured dose (at 10 x 10 cm2 field size and 90 cm source-skin distance). The central axis depth-dose curves of electron contamination were calculated for various field sizes from 5 x 5 cm2 to 40 x 40 cm2. We investigated the components that generated the electron contamination for a field size of 10 x 10 cm2. The optimal initial electron beam energy was 6.3 MeV with a full-width half maximum (FWHM) of the radial intensity distribution of 1.0 mm. These parameters were found to be in good agreement with the measured data. Electron contamination increased as the field size increased. At a depth of 1.0 mm and field sizes of 5 x 5, 10 x 10, 20 x 20, 30 x 30, and 40 x 40 cm2, the doses from electron contamination were 3.71, 5.19, 14.39, 18.97 and 20.89 %, respectively. Electron contamination decreased with increased depth. At a depth of 15 mm, the electron contamination was about 1 %. It was mainly generated in the air column between the linac head and the phantom (3.65 %), the mirror (0.99 %), and the flattening filter (0.59 %) (for the depth of 1.0 mm and the field size of 10 x 10 cm2).
ANALISIS PERFORMA TIMBAL DAN BESI MEREDAM RADIASI FOTON 2 MEV DENGAN SIMULASI MONTE CARLO Sitti Yani
JOURNAL ONLINE OF PHYSICS Vol. 7 No. 2 (2022): JOP (Journal Online of Physics) Vol 7 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v7i2.18224

Abstract

Penelitian ini bertujuan untuk menganalisis performa dua material perisai, Timbal dan Besi, dalam mengatenuasi partikel foton berenergi 2 MeV dengan simulasi Monte Carlo (MC). Kode MC EGSnrc digunakan sebagai perangkat lunak yang mensimulasikan interaksi sumber foton dengan material perisai. Sumber diletakkan pada jarak 10 cm, 50 cm, dan 100 cm dari perisai. Ketebalan perisai juga divariasikan pada nilai 5 cm, 10 cm, dan 15 cm. Scoring plane didefinisikan setelah perisai yang bertanggung jawab menyimpan data partikel yang melewati perisai dan dianalisis untuk memperoleh karakteristik distribusi spektrum partikel-partikel tersebut. Distribusi spektrum pada kedua material perisai sangat dipengaruhi oleh jarak antara sumber dengan perisai dan ketebalannya. Jarak sumber dan perisai yang jauh menyebabkan meningkatnya jumlah partikel yang melewati perisai baik pada Timbal maupun Besi. Sementara itu, interaksi Compton dan efek fotolistrik terjadi ketika foton memasuki material perisai. Perisai yang tebal menyebabkan foton mendeposisikan keseluruhan energinya ketika berinteraksi dengan atom perisai sehingga foton yang sampai pada scoring plane lebih sedikit dibanding pada perisai yang ketebalannya lebih rendah. Partikel sekunder yakni elektron juga dihasilkan akibat interaksi ini. Timbal dapat mengatenuasi lebih dari 90% foton yang melewatinya sedangkan Besi dapat mengatenuasi pada nilai persentase yang lebih rendah. Hal ini dipengaruhi oleh perbedaan densitas kedua material.
Analisis Kurva Dose Volume Histogram (DVH) pada Teknik 3D Konformal dengan Metode Monte Carlo Sitti Yani
POSITRON Vol 11, No 1 (2021): Vol. 11 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.918 KB) | DOI: 10.26418/positron.v11i1.44052

Abstract

Pemilihan sudut penyinaran yang tepat dalam terapi 3D konformal beberapa jenis kanker sangat menentukan keberhasilan pengobatan. Oleh karena itu, tujuan penelitian ini adalah untuk menganalisis dose volume histogram (DVH) teknik 3D konformal dengan konfigurasi sudut penyinaran yang berbeda pada fantom inhomogenitas dengan metode Monte Carlo (MC). EGSnrc-DOSXYZnrc MC digunakan untuk menyimulasikan teknik 3D konformal pada fantom inhomogenitas. Fantom inhomogenitas terdiri atas material air dan paru-paru dimana material paru-paru berada di dalam fantom air pada kedalaman 2 cm dari permukaan fantom air. Fantom ini diradiasi dengan sumber radiasi monoenergetik 10 MeV dengan sudut penyinaran 0 – 360o. Data distribusi dosis yang diperoleh diolah untuk memperoleh data DVH. Analisis DVH juga dilakukan dengan mengkombinasikan beberapa sudut penyinaran dan pembobotan. Hasil yang diperoleh menunjukkan bahwa distribusi dosis hasil simulasi beragam terhadap sudut penyinaran. Dari kurva DVH diperoleh bahwa sudut penyinaran pada 0o, 20o, 40o, 320o, dan 340o dengan pembobotan memberikan kurva DVH target yang paling baik dibandingkan dengan set-up sudut penyinaran lainnya. Pembobotan dapat mereduksi dosis pada resiko organ dan meningkatkan dosis pada target.
ANALISIS DISTRIBUSI FLUKS NEUTRON DAN LAJU DOSIS SINAR GAMMA PADA KOLOM TERMAL REAKTOR KARTINI UNTUK BORON NEUTRON CAPTURE THERAPY (BNCT) DENGAN SOFTWARE PHITS Yani, Sitti
Jurnal Fisika Vol 12, No 2 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v12i2.40121

Abstract

Dalam penelitian ini dilakukan modifikasi desain kolom termal reaktor Kartini secara komputasi menggunakan metode Monte Carlo dengan software Particle and Heavy Ion Transport Code System (PHITS). Distribusi fluks neutron dan laju dosis sinar gamma yang dihasilkan oleh reaktor ini dianalisis untuk memastikan beberapa parameter telah memenuhi ketentuan IAEA untuk keperluan BNCT. Material yang digunakan dalam simulasi ini yaitu 16 cm Al, 12 cm Pb, 15 cm Ni, dan 87 cm grafit pada modifikasi 1 dan 87 cm, 74.5 cm, dan 61.5 cm pada modifikasi 2. Energi yang digunakan yaitu sebesar 2 MeV, 2.5 MeV, dan 3 MeV. Hasil simulasi dari desain tersebut dilakukan analisis parameter fluks neutron epitemal, neutron cepat, dosis gamma, rasio antara fluks termal dan epitemal, serta rasio antara arus neutron dan fluks neutron total. Modifikasi 2 dengan energi 2 MeV dan 2.5 MeV menunjukkan modifikasi terbaik untuk simulasi kolom termal yang sesuai dengan ketentuan IAEA yaitu menghasilkan fluks neutron epitermal sebesar 1.78×109 n/cm2s dan 1.46×109 n/cm2s serta dosis gamma sebesar 1.72×10-13 Gycm2/n dan 1.91×10-13 Gycm2/n.
EGS++: Optimasi parameter transport dalam simulasi Sitti Yani
Jurnal Ilmu Fisika Vol 15 No 1 (2023): March 2023
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.15.1.66-72.2023

Abstract

MC transport parameters used are common to all egs++ applications. The effect of each transport parameter need to understand to optimize the simulation process. Therefore, the purpose of this study was to investigate the efficiency of egs++ simulation for different transport parameters in water phantom. This water phantom has built using slab. Collimated source defined 100 cm above the phantom. The simulation parameters such as the efficiency, statistical uncertainty, and accuracy of selecting transport parameters such as electron and photon cut-off energies, spin effects, atomic relaxations, and bound Compton scattering was investigated. The selection of ECUT and PCUT greatly affects the simulation time. The simulation time, efficiency and energy fractions have same value for varied ECUT except for 0.521 MeV. The energy fraction have been shifted but the simulation time and efficiency were same. Turning on spin effects in this simulation increases simulation time by 25%. The simulation time increases by about 15% when relaxations are turned on. The more accurate result of deposited energy using EGSnrc algorithm is about 30% slower than the less accurate PRESTA-I algorithm. Therefore, The optimization of transport parameters is needed in the simulation of egs++ to provide the best efficiency.
Efektivitas Tungsten sebagai perisai radiasi foton Sitti Yani
Jurnal Teori dan Aplikasi Fisika Vol 11, No 2 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i2.3165

Abstract

Tungsten is a material that has a high density and atomic number which is a potential candidate for photon shielding. In this study, Tungsten material with a thickness of 10 cm was used as a shield for photon with energies of 2 MeV, 3.3 MeV, and 5 MeV. This material shielding was simulated with Monte Carlo based software, Particle and Heavy Ion Transport System (PHITS). The dimensions of the shield material are 40×40×10 cm3 which are placed at various distances from the source:20 cm, 50 cm, and 100 cm. The results obtained show that these photons with energies of 2, 3.3, and 5 MeV can be attenuated by the shield at all defined source distances. The flux of particles passing through the shield decreases with increasing distance. Therefore, Tungsten material can be a candidate for photon shielding in the medical physics field.
ANALISIS DAN SINTESIS BUNYI PETIKAN KALIMBA MENGGUNAKAN TRANSFORMASI FOURIER Abd Djamil Husin; Indriyanti Rahmi Setyani; Sidikrubadi Pramudito; Sitti Yani; Ardian Arif Setiawan
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.259-266

Abstract

This research aims to analyze the sound produced by kalimba plates using the Fourier transformation. This research went through two stages, namely the analysis stage and the synthesis stage. The kalimba plate is plucked with variations in the applied force of 2 N to 5.5 N. The sound of the kalimba pluck is recorded using a sound sensor connected to PASCO Capstone software so that a deviation graph is produced as a function of time. The data obtained was then analyzed using Octave software. The research results show that the frequency is directly proportional to the damping coefficient value. The higher the frequency, the higher the frequency spectrum will be widened. The resulting Fourier coefficients only capture the values of the fundamental harmonic frequencies. This is because the kalimba plate has high rigidity.
Analysis and Synthesis of Guitar Sounds with Hammer on Strumming Technique Abd Djamil Husin; Koharudin Koharudin; Sidikrubadi Pramudito; Sitti Yani; Rima Fitria Adiati
PILLAR OF PHYSICS Vol 16, No 2 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15354171074

Abstract

This research aims to analyze and synthesize periodic signals derived from guitar string plucking with hammer-on technique. This research has three stages, namely the data collection stage, the analysis stage, and the synthesis stage. The guitar string was plucked with a tension of 2.5 N and recorded using a sound sensor connected to PASCO Capstone software. The data used has two variations, namely the sound signal of a hammer-on pluck with a half tone increase and a one tone increase. Data analysis was carried out using MATLAB software to obtain deviation graphs as a function of frequency, damping coefficient values, and frequency spectra. The results showed that after hammer-on the amplitude of the tone decreased drastically as the mass per unit length of the string decreased. The initial tone before the hammer-on will appear in the tone after the hammer-on with a lower amplitude as the mass per unit length of the string increases. The synthesis of guitar sounds with this technique is done by combining the individual tones obtained and adjusting the time interval and amplitude according to the literature data
Analysis of Secondary Particles Produced by 50-500 MeV Muon and Water Interaction using PHITS Monte Carlo Package Yani, Sitti; Hidayatuloh, Dadan; Sumaryada, Tony
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.63-70.2024

Abstract

Secondary particles will always be generated in particle-to-matter interactions. The interaction of muons with matter produces various secondary particles. In this study, secondary particles produced by the interaction between muons with energies of 5, 50, 100, 200 and 500 MeV with water were analyzed using the PHITS Monte Carlo package. The muon source is placed on the surface of water that has a thickness of 1 km. The muography technique was applied by placed a detector at a depth of 1 km from the source. This detector records the secondary particles produced by the interaction. The results obtained show that this interaction produces secondary particles in the form of photons and neutrons in the detector. The number and energy of these photons and neutrons are strongly influenced by the initial energy of the muon. Muons with the lowest energy of 5 MeV produce more secondary particles than any other energy by a factor of 10. Low-energy muons travel slowly, allowing more interactions to occur and increasing the number of secondary particles in the detector. The energies of neutrons and photons in the detector are at most 3.76 MeV and 5.3 MeV, respectively.
Co-Authors Abd Djamil Husin Adiati, Rima Ardian Arif Choirul Anam Dadan Hidayatuloh Djarwani S Soejoko Efendi, M. Arif Fadhillah, M. Freddy Haryanto Freddy Haryanto Geoff Dougherty Hidayatuloh, Dadan Husin, Abd. Djamil Indriyanti Rahmi Setyani Koharudin Koharudin Nikmah, Khusniatun Nuramdiani, Dian Octavia, Shella Salsa Ramadhan, Muhammad Vitro Rhani, Muhammad Fahdillah Rima Fitria Adiati Sidikrubadi Pramudito Sidikrubadi Pramudito Sudiro, Sukma Tri Adinda Tony Sumaryada