By a News Reporter-Staff News Editor at Science Letter -- Fresh data on Applied Radiation Research are presented in a new report. According to news reporting originating from Guildford, United Kingdom, by NewsRx correspondents, research stated, "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 3 mol."
Our news editors obtained a quote from the research from the University of Surrey, "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% H-2 and 25% CH4 in 75% H-2. Characterization of formations used FESEM, XRD and EDX. The nanophosphors consisted of particles of sizes in the range 85-150 nm, the thermoluminescence (TL)-based radiation detection medium giving rise to a single peaked glow curve of maximum yield at a temperature of 250 degrees C at a heating rate of 5 degrees C/s. The TL response increased linearly with radiation dose, ZnS doped to 2 mol 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."
According to the news editors, the research concluded: "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."
For more information on this research see: A search for novel thermoluminescent radiation dosimeter media. Applied Radiation and Isotopes, 2013;82():126-129. Applied Radiation and Isotopes can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Applied Radiation and Isotopes - www.elsevier.com/wps/product/cws_home/228)
The news editors report that additional information may be obtained by contacting K.H. Al-Hinai, University of Surrey, Dept. of Phys, Guildford GU2 7XH, Surrey, United Kingdom. Additional authors for this research include N.B. Mohd, N.R. Zulkepely, R.M. Nor, Y.M. Amin and D.A. Bradley (see also Applied Radiation Research).
Keywords for this news article include: Europe, Guildford, United Kingdom, Applied Radiation Research
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC