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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Al-Hinai, Khalid H. Benkara Mohd, Nadjima Rozullyah Zulkepely, Nurul Md Nor, Roslan Mohd Amin, Yusoff Bradley, D. A. |
| Description | Author Affiliation: Al-Hinai KH ( Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: yusoffmohdamin@um.edu.my.) |
| Abstract | We describe two example pilot efforts to help define new thermoluminescent dosimeter media. The first concerns ZnS:Mn nanophosphors, prepared by chemical precipitation using zinc and sodium sulfate, doped with manganese sulfate at concentrations varying from 1 to 3mol. The second concerns chemical vapor deposited diamond, produced as a thin film or as amorphous carbon on a single-crystal silicon substrate, each deposited under the same conditions, use being made of the hot filament-chemical vapor deposition (HFCVD) technique. The gas concentrations used were 1% CH4 in 99% H2 and 25% CH4 in 75% H2. Characterization of formations used FESEM, XRD and EDX. The nanophosphors consisted of particles of sizes in the range 85-150nm, the thermoluminescence (TL)-based radiation detection medium giving rise to a single peaked glow curve of maximum yield at a temperature of 250°C at a heating rate of 5°C/s. The TL response increased linearly with radiation dose, ZnS doped to 2mol of Mn being found the most sensitive. Regarding chemical vapor deposited (CVD) carbon, inappreciable TL was found for the resultant ball-like amorphous carbon films, graphite, and the silicon substrate, whereas CVD diamond films showed a promising degree of linearity with dose. For both the ZnS and diamond samples, TL signal fading was appreciable, being some 40% per day for ZnS and>50% per day for CVD films even under storage in the dark at room temperature, making it apparent that there is need to adjust parameters such as the size of nanoparticles. |
| File Format | HTM / HTML |
| ISSN | 09698043 |
| Volume Number | 82 |
| e-ISSN | 18729800 |
| Journal | Applied Radiation and Isotopes |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-12-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Nuclear Medicine Thermoluminescent Dosimetry Methods Diamond Gamma Rays Humans Manganese Metal Nanoparticles Ultrastructure Microscopy, Electron, Scanning Particle Size Pilot Projects Silicon Sulfides X-ray Diffraction Zinc Compounds Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Radiation |
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