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All Journal Jurnal Fisika Unand
Fransischa Ramona
Departemen Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Peningkatan Absorpsi Cahaya pada Nanostruktur TiO₂ Terdoping Cu dan Ni untuk Aplikasi Pemisahan Air Fotokatalitik Noni Novianti; Fransischa Ramona; Diana Vanda Wellia; Mulda Muldarisnur
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.
Estimasi dan Kontribusi Dosis Radiofarmaka dan CT pada Pemeriksaan Bone Scan dengan SPECT/CT Fransischa Ramona; Afdhal Muttaqin; Yola Despriani
Jurnal Fisika Unand Vol 15 No 5 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.5.553-561.2026

Abstract

Bone scintigraphy using Technetium-99m methylene diphosphonate (Tc-99m MDP) is a nuclear medicine imaging procedure widely used for the diagnosis of various skeletal disorders. The use of hybrid Single-Photon Emission Computed Tomography/Computed Tomography (SPECT/CT) provides simultaneous functional and anatomical information; however, it also results in radiation exposure from both the administered radiopharmaceutical and the CT component. This study aimed to estimate the effective doses associated with the radiopharmaceutical and CT components and to determine their respective contributions to the total estimated effective dose in bone scan SPECT/CT examinations. A retrospective study was conducted in 44 patients who underwent bone scan SPECT/CT examinations at Dr. M. Djamil Hospital, Padang, Indonesia, between March and May 2026. The radiopharmaceutical effective dose was estimated based on the administered Tc-99m MDP activity, whereas the CT effective dose was estimated from the Dose-Length Product (DLP). The mean administered radiopharmaceutical activity was 707.83 ± 106.27 MBq, corresponding to an estimated effective dose of 3.47 ± 0.52 mSv. The mean DLP was 642.09 ± 188.54 mGy·cm, corresponding to an estimated CT effective dose of 8.35 ± 2.48 mSv. The mean total estimated effective dose was 11.82 ± 2.74 mSv. The CT component contributed 69.72% of the total estimated effective dose, whereas the radiopharmaceutical component contributed 30.28%. These findings indicate that the CT component contributed a greater proportion of the total estimated effective dose in bone scan SPECT/CT examinations.
Co-Authors Afdhal Muttaqin Muldarisnur, Mulda Noni Novianti Wellia, Diana Vanda Yola Despriani