The influence of post-exposure heating on the stability of MCP-N (LiF:Mg,Cu,P) TL detectors
| Autor: | M. Budzanowski |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Maximum intensity
Radiation Materials science Post exposure Hot Temperature Radiological and Ultrasound Technology Annealing (metallurgy) Detector Public Health Environmental and Occupational Health Analytical chemistry Phosphorus General Medicine Thermoluminescence Sensitivity and Specificity Highly sensitive Fluorides Reference Values Lithium Compounds Dosimetry Radiology Nuclear Medicine and imaging Fading Magnesium Thermoluminescent Dosimetry Copper |
| Zdroj: | Radiation protection dosimetry. 101(1-4) |
| ISSN: | 0144-8420 |
| Popis: | Post-exposure annealing of highly sensitive LiF:Mg,Cu,P (MCP-N) detectors, at 100 degrees C over 10 or 20 min prior to readout, is usually recommended for routine dosimetry. The purpose of this anneal is to eliminate low-temperature peaks, especially peak 3, which fades at room temperature in about 3 months. However, as this annealing procedure does not entirely eliminate peak 3, 10% of its thermoluminescent (TL) signal still being readable, a fading correction must be applied. The aim of this work was to optimise the conditions of post-exposure treatment, i.e. its temperature and duration, in order to facilitate the use of MCP-N detectors in routine dosimetry. MCP-N detectors were annealed in standard conditions, i.e. at 240 degrees C over 10 min and exposed to a dose of 5 mGy (137Cs). For post-exposure annealing, six different temperatures between 100 degrees C and 150 degrees C and two time periods (10 and 20 min) were tested. TL glow curves were deconvoluted with the GCA code. A post-exposure anneal at 120 degrees C over 10 min was found to be optimal. Heating at this temperature eliminates 100% of the TL signal of peak 3, while maintaining the area and maximum intensity of the main peak 4 unchanged. In this case, no fading correction needs to be applied. Annealing at higher temperatures, up to 150 degrees C, results in a loss of peak 4 signal, and is therefore not recommended. |
| Databáze: | OpenAIRE |
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