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Nurmalita .
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The Effect of Sintering Time on Surface Morfology of Pb-Doped Bi-2223 Oxides Superconductors Prepared by the Solid State Reaction Methods at 840 oC Evi Yufita; Nurmalita .
Journal of Aceh Physics Society Volume 5 Number 1, March 2016
Publisher : PSI-Aceh

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Abstract

This study was investigating the effect of sintering time (30 h, 32 h, and 34 h) on surface morphology of PbdopedBi-2223 oxides of superconductors prepared by the solid-state reaction method at 840 oC. Thesuperconductor was characterized by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).In the present study, phase purity, volume fraction, surface morphology, texturing, crystallinity, grainconnectivity and grain size of the bulk samples are found and compared with each other. The enhancementin the sintering time is confirmed that it will decrease Bi-2223 phase fraction and increase the impurity ofthe samples. SEM images shows that the sample has the best crystallinity, grain connectivity and largestgrain size. Based on the present results, it is conclude that the surface morphological is improving with theincreasing of the sintering time.
The DC Electrical Resistivity Curves of Bismuth-2212 Ceramic Superconductors: Evaluation of the Hole-Carrier Concentrations per-Cu Ion nurmalita .
Journal of Aceh Physics Society Volume 5 Number 1, March 2016
Publisher : PSI-Aceh

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Abstract

In this study the samples of Bismuth ceramic superconductors were synthesized by the melt textured growth methods from a 2212 stoichiometric composition in order to obtain a large amount of pure Bi-2212. The effects of Pb substitution on the properties of Bi-based Bi2−xPbxSr2CaCu2Oy superconductor with x = 0, 0.2, and 0.4 were investigated by means of DC electrical resistivity measurements. It has been found that the hole-carrier concentrations per-Cu ion of the samples change independently of Pb content.
The Method of CT Dosimetry Based on the CTDI (Computed Tomography Dose Index) for the Treatment of the Human's Head Rini Safitri; Nurmalita .
Journal of Aceh Physics Society Volume 3 Number 1, March 2014
Publisher : PSI-Aceh

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Abstract

The method of CT dosimetry based on the CTDI is a common measurement method by using a single, axial rotation about a pencil chamber in a stationary phantom. For some time now there has been a growing awareness that radiation dose originating from medical diagnostic procedures in radiology, is contributing an increasing proportion to the total population dose, with a large component coming from CT examinations. This is accompanied by rapid developments in CT technology, including the use of increasingly wide X ray scanning beams, which are presenting problems in dosimetry that currently cannot be adequately addressed by existing standards. When preparing any dosimetric assessment of a CT scanner it is essential to have a good knowledge of the production of X rays and the characteristics of the CT scanner. Factors that influence the X ray beam intensity and photon spectrum are the tube voltage, the anode material, and anode angle, the filtration of the X ray tube, and the tube current. The properties of the radiation field for CT dose considerations can be characterized by free in air measurements of air kerma (absorbed dose in air). Measurements in standard cylindrical phantoms yield dosimetric quantities such as CTDI that can be considered as a patient dose index, and are also useful for quality assurance purposes, however they should not be interpreted as patient dose.
Synthesis and Microstructure Properties of (Bi,Pb)2Sr2Ca1Cu2Oy Ceramic Superconductor nurmalita .; Zuraini .; Evi Yufita; Fauzi .
Journal of Aceh Physics Society Volume 4 Number 1, March 2015
Publisher : PSI-Aceh

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Abstract

Properties of (Bi, Pb)2Sr2Ca1Cu2Oy ceramic superconductors were prepared by the melt textured growth methods in order to investigate the effects of the slow cooling time on the microstructur.  Phase analyses of the samples by X-ray diffraction (XRD) has been carried out to assess the effects of the slow cooling time. From XRD analyses, the addition to the sample of  the slow cooling time degrades formation of the high-Tc Bi-2212 phase. The possible reasons for the observed degradation in the microstructure properties due to the slow cooling time addition were discussed.
Co-Authors Evi Yufita Fauzi . Rini Safitri Zuraini .