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All Journal Jurnal Pendidikan Fisika Undiksha Jurnal Sains dan Teknologi JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI JOURNAL ONLINE OF PHYSICS Jurnal Fisika FLUX Jurnal Penelitian Pendidikan IPA (JPPIPA) International Journal of Community Service Learning Indonesian Physical Review
I Putu Tedy Indrayana
Program Studi Fisika Universitas Udayana Bali
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences Other

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ANALISIS PARAMETER MIKROSTRUKTUR NANOPARTIKEL Mn1-xZnxFe2O4 BERDASARKAN POLA DIFRAKSI SINAR X Indrayana, I Putu Tedy
JST (Jurnal Sains dan Teknologi) Vol. 8 No. 1 (2019)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1488.068 KB) | DOI: 10.23887/jstundiksha.v8i1.13016

Abstract

The Mn-Zn Ferit is a magnetic material which has potential applications for data storage device, the inductor coil and catalysis. This material has unique electrical and optical properties. Their properties are microstructural dependent. In this work, we studied the microstructural parameters of Mn1-xZnxFe2O4 which x assigns the mole fraction of Mn2+ and Zn2+ (x = 0.6; 0.7 and 0.8). Samples were synthesized by using coprecipitation method and NaOH as a coprecipitant. Microstructural parameters were investigated based on X-ray diffraction pattern. The crystallite size and strain were determined by using Size-strain plot (SSP) method. The crystallite size of nanoparticles is in a range of 18.9 nm – 24.8 nm, while the strain is in a range of 0.0012 – 0.0099. The lattice parameter is in a range of 8.531Ǻ - 8.567Ǻ bigger than the values were calculated theoretically according to the theoretical cation distribution model. The cation distribution in crystal lattice takes important rule in determining the microstructural parameters of nanoparticles. 
PARTICLES SIZE AND LATTICE STRAIN EFFECT ON THE OPTICAL CONSTANTS OF Fe3O4 NANOPARTICLES Indrayana, I Putu Tedy; Tuny, Margaretha Tabita
Indonesian Physical Review Vol. 4 No. 1 (2021)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v4i1.71

Abstract

In the case of optical sensors such as the Surface Plasmon Resonance (SPR) sensor, the Fe3O4 nanoparticles play a role to boost the signal however they can increase the detection sensitivity of the biosensor. For this application, the optical properties of Fe3O4 nanoparticles need to be studied. The optical properties are described in terms of their optical constants. Therefore, this work was purposed to study the effect of the particle size and lattice strain on the optical constants of Fe3O4 nanoparticles. Samples were synthesized by using the coprecipitation technique. Two calcination temperatures, i.e., 150oC and 250oC for 4 hours were applied to the samples. Samples were characterized for their diffraction pattern and optical properties by using XRD and Specular UV-Vis Spectroscopy technique, consecutively. The particle size and lattice strain were estimated by using the Williamson-Hall (W-H) method. The effect of the particle size and their optical constants on the reflectance curve in the SPR sensor application was also performed toward a simulation by using Winspall 3.02 software. The results show that calcination temperature causes an increase in particle size and a decrease in lattice strain. The optical constants, such as absorbance (A), absorption coefficient (α), extinction coefficient (k), refractive index (n), dielectric constants (ε), optical conductivity (σ), and the Urbach energy (Eu) significantly depended on particles size and lattice strain. However, the particle size and optical constant were significantly influent the SPR angle in the reflectance curve of Fe3O4
Comparison of Dose Distribution with Graphical Optimization and Inverse Planning Techniques in Cervical Cancer Brachytherapy Ratini, Ni Nyoman; Jaya, I Putu Wesa Angga; Sutapa, Gusti Ngurah; Indrayana, I Putu Tedy; Nurmalasari, Ni Putu Yuni; Sudarsana, I Wayan Balik
Jurnal Penelitian Pendidikan IPA Vol 12 No 2 (2026): In Progress
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i2.12900

Abstract

Cervical cancer is the leading cause of death among women in Indonesia, with 36,964 new cases reported in 2022. Brachytherapy is a key component in treating advanced-stage cervical cancer, where dose optimization is critical to maximize the target dose (HRCTV) and minimize exposure to organs at risk. Graphical Optimization (GrO) and Inverse Planning (IP) techniques are commonly used, but comparative studies using Co-60 sources remain limited. Previous studies have largely used Ir‑192, so this study explores the comparison of GrO versus IP using Co‑60, which has not been widely studied in Indonesia. Co‑60 was chosen because it provides a dose distribution comparable to Ir‑192, has a longer half‑life reducing the frequency of source replacements and maintenance costs and has been reported to shorten patient treatment time by approximately 10%. This study compared the dose distribution of both techniques in 30 brachytherapy patients treated with a Co-60 source at Prof. Dr. I.G.N.G. Ngoerah Hospital. Data were analyzed using the Sagiplan 2.2.1 Treatment Planning System (TPS) following the TG-43 protocol. Evaluations included D90 HRCTV, COIN, DHI, bladder D2cc, and rectum D2cc based on ICRU Report 89 recommendations. MANOVA results (SPSS 29.0; significance < 0.05) showed that GrO’s D90 HRCTV (7.239 Gy ± 0.134 Gy) was significantly higher (sig = 0.006) than IP (7.155 Gy ± 0.093 Gy). GrO’s DHI (0.352 ± 0.043) was also superior (sig = 0.030), while COIN, bladder D2cc, and rectum D2cc showed no significant differences. Overall dose distribution for GrO differed significantly from IP (p = 0.011), though all parameters met ICRU standards. Conclusion: GrO excels in target coverage and homogeneity, while IP is equivalent in OAR protection. Both techniques are dosimetrically feasible, but GrO is more adaptive for complex anatomies despite requiring longer planning time.
Co-Authors Adrian Rahmat Nur Bayu A. Sadjab Edi Suharyadi Ferni Malega Fiar Tri Santika Gusti Ayu Rai Tirta Gusti Ngurah Sutapa Hanny F. Sangian Harsen Berg Janis Hery Suyanto Huragana, Y M Iwamony, Steven Jaya, I Putu Wesa Angga Khafidh Nur Aziz Kurnia Kurnia Malega, Ferni Malega, Ferni Manumpil, A Ni Luh Putu Trisnawati Ni Nyoman, Ratini Novita Kundiman Nurmalasari, Ni Putu Yuni Puni, M S Rofiqul Umam Steven Iwamony Sudarsana, I Wayan Balik Tuny, Margaretha Tabita