Analysis of Glow Curve Kinetics of CaF2:Tm (TLD-300) Based on a General Order Model
| Autor: | F. Nazeri, M. Jafarizadeh, M. Sohrabi |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Radiation
Materials science Radiological and Ultrasound Technology business.industry Kinetics Public Health Environmental and Occupational Health Analytical chemistry General Medicine Activation energy Atmospheric temperature range Kinetic energy Isothermal process Thermal Order (group theory) Radiology Nuclear Medicine and imaging Thermoluminescent dosimeter Nuclear medicine business |
| Zdroj: | Radiation Protection Dosimetry. 84:119-122 |
| ISSN: | 1742-3406 0144-8420 |
| Popis: | The glow curve structure and kinetics parameters of CaF 2 :Tm (TLD-300) were investigated at a test dose of 90 Sr β rays. A new peak at 68°C, called la, was recognised in the complex structure of the initial part of the glow curve. By applying a thermal bleaching method using a heating rate of 2°C.s -1 , seven glow peaks (la to 6) were separated at a temperature range of 33 to 314°C. The kinetic parameters including order of kinetics (b), activation energy (E), and frequency factor (s) were determined, based on the general order (GO) model. The methods include Chen's peak shape (PS) as applied to all glow peaks, isothermal decay (ID) to peaks 3 and 5, and variable heating rate (VHR) to peaks 1, 3, 5 and 6. The order of kinetics (b) determined is more than one for all the peaks except for peak 3, which was found to be 1 by the ID method. The results are compared to those of others. |
| Databáze: | OpenAIRE |
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