Article Per Year (5 Year)
p-Index From 2021 - 2026
0.23
P-Index
This Author published in this journals
All Journal Jurnal Fisika Unand
Ramona, Fransischa
Unknown Affiliation
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Verifikasi Nilai Dosis Radiasi Berkas Elektron Pesawat LINAC dengan Luas Lapangan Blok Cerrobend (6×6) cm2 dan (8×8) cm2 Berdasarkan Protokol IAEA TRS 398 Ramona, Fransischa; Milvita, Dian; Diyona, Fiqi
Jurnal Fisika Unand Vol 9 No 2 (2020)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.9.2.238-243.2020

Abstract

Telah dilakukan penelitian  verifikasi nilai dosis radiasi berkas elektron pesawat LINAC dengan luas lapangan blok cerrobend (8×8) cm2, (6×6) cm2 dan tanpa blok (10×10) cm2. Penelitian bertujuan memperoleh  nilai dosis radiasi menggunakan blok cerrobend dan tanpa blok agar sesuai dengan dosis radiasi Treatment Planning System (TPS) dan batas toleransi yang ditetapkan protokol IAEA TRS 398 yaitu ±2%.  Pada penelitian digunakan energi berkas elektron (4, 6, 9, dan 12) MeV menggunakan slab phantom dengan detektor ionisasi chamber plane parallel.  Ketebalan blok cerrobend yang digunakan adalah 1,83 cm.  Hasil penelitian menunjukkan bahwa dosis radiasi yang dihasilkan menggunakan blok cerrobend lebih tinggi daripada tanpa menggunakan blok cerrobend. Hal ini karena semakin luas ukuran lapangan radiasi, maka akan semakin rendah dosis radiasi yang diterima dan semakin banyak radiasi hambur terjadi.  Nilai deviasi dosis radiasi yang terukur pada slab phantom terhadap dosis radiasi TPS masih memenuhi toleransi yang ditetapkan oleh protokol IAEA TRS 398 yaitu  -0,81 % sampai dengan 1,36%. Verification of radiation values of instrument LINAC electron beam with field size of the cerrobend block (8×8) cm2, (6×6) cm2and without block (10×10) cm2 has been conducted.  This study aims to get the value of radiation dose using cerrobend blocks and without block to equal with dose radiation Treatment Planning System (TPS) and the tolerance limits established protocol IAEA TRS 398 which is ± 2%. The study use electron beam energy (4, 6, 9, and 12) MeV using slab phantom with ionization chamber plane parallel detectors.  The thickness of the cerrobend block use  1.83 cm. The results show that using cerrobend block produce a greater dose radiation than without block.  This due to the larger the size of the radiation field, the lower the dose received and the more scaterring radiation. Deviation value dose radiation of measurement in slab phantom to dose radiation TPS still within the tolerance by protocol IAEA TRS 398 that is -0.81% to 1.36%.
Peningkatan Absorpsi Cahaya pada Nanostruktur TiO₂ Terdoping Cu dan Ni untuk Aplikasi Pemisahan Air Fotokatalitik Novianti, Noni; Ramona, Fransischa; Wellia, Diana Vanda; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.635-643.2025

Abstract

This study reports the enhancement of light absorption by TiO₂ nanoparticles when doped with Ni and Cu nanoparticles. Numerical simulations were performed using the boundary element method. The absorbance in the visible region of Ni-doped TiO₂ increases compared to pure TiO₂. The increase in absorbance is accompanied by a shift in the absorption band edge to a longer wavelength (redshift) due to the formation of new energy levels that narrow the band gap. Cu-doped TiO₂ exhibits a more significant increase in absorbance and a wider absorption range. Both dopants decrease the band gap relative to pure TiO₂, with Cu doping producing a greater decrease. Ni and Cu doping enhance the optical response of TiO₂ in the visible region. Cu doping has the most dominant effect in broadening the absorption and lowering the band gap energy. These findings indicate that Ni- and Cu-based dopant engineering is a potential approach to improve the performance of TiO₂-based materials in photocatalytic applications such as hydrogen production by water splitting.
Co-Authors Dian Milvita Fiqi Diyona, Fiqi Muldarisnur, Mulda Novianti, Noni Wellia, Diana Vanda