- Title
- Orthopaedic grade ultra–high molecular weight polyethylene: some features of the main thermoluminescence glow curve
- Creator
- Chithambo, Makaiko L
- Date Issued
- 2006
- Date
- 2006
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/125499
- Identifier
- vital:35789
- Identifier
- https://doi.10.1093/rpd/nci661
- Description
- Thermoluminescence (TL) characteristics of orthopaedic–grade ultra–high molecular weight polyethylene have been investigated between 20 and 200_C. The TL at 1_C s_1 consists of two glow curves, a weaker intensity peak at 115_C and the main peak at 70_C, studied in this work. TL intensity increases with beta irradiation but with a dose–response influenced by heating rate. On the other hand, the peak maximum is affected by both irradiation and repeated use of a sample. The glow curve shifts to higher temperatures with increase in heating rate but only slightly so with change in beta irradiation dose, properties suggestive of first-order kinetics. Kinetic analysis for activation energy and order of kinetics, based on the discrete trap model, produce somewhat conflicting results. Whereas qualitative analysis of peak symmetry show that first-order kinetics apply, geometrical analysis of the peak shape suggests that the order of kinetics might be other than first-order. Values of activation energy evaluated using the initial rise method were found to be dose dependent and for a given beta dose are in agreement with calculations from peak shape and initial rise methods but less so with results from variable heating rate method.
- Format
- 4 pages
- Format
- Language
- English
- Relation
- Radiation protection dosimetry
- Relation
- Chithambo, M.L., 2006. Orthopaedic grade ultra–high molecular weight polyethylene: some features of the main thermoluminescence glow curve. Radiation protection dosimetry, 119(1-4), pp.157-160
- Relation
- Radiation protection dosimetry volume 119 number 1-4 157 160 2006 0144-8420
- Rights
- Radiation protection dosimetry
- Rights
- Use of this resource is governed by the terms and conditions of the Oxford Academic Journals Open Access Statement (https://academic.oup.com/journals/pages/open_access)
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RU Department of Physics and Electronics
Chithambo, Makaiko Liwiro (Prof)
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