Thermoluminescence solid-state nanodosimetry--the peak 5A/5 dosemeter
| Autor: | Anatoly B. Rosenfeld, H. Datz, E. Fuks, A. Horowitz, Stephen A. Marino, Y.S. Horowitz, L. Oster, M. Rainer |
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| Rok vydání: | 2010 |
| Předmět: |
Progress in Experimental Microdosimetry
Radiation Materials science Radiological and Ultrasound Technology Public Health Environmental and Occupational Health Analytical chemistry Equipment Design General Medicine Electron Radiation Dosage Kinetic energy Thermoluminescence Ion Equipment Failure Analysis Nuclear magnetic resonance Semiconductors Ionization Nanotechnology Thermoluminescent Dosimetry Radiology Nuclear Medicine and imaging Irradiation Luminescence |
| Zdroj: | Radiation Protection Dosimetry. 143:416-426 |
| ISSN: | 1742-3406 0144-8420 |
| DOI: | 10.1093/rpd/ncq479 |
| Popis: | The shape of composite peak 5 in the glow curve of LiF:Mg,Ti (TLD-100) following (90)Sr/(90)Y beta irradiation, previously demonstrated to be dependent on the cooling rate used in the 400°C pre-irradiation anneal, is shown to be dependent on ionisation density in both naturally cooled and slow-cooled samples. Following heavy-charged particle high-ionisation density (HID) irradiation, the temperature of composite peak 5 decreases by ∼5°C and the peak becomes broader. This behaviour is attributed to an increase in the relative intensity of peak 5a (a low-temperature satellite of peak 5). The relative intensity of peak 5a is estimated using a computerised glow curve deconvolution code based on first-order kinetics. The analysis uses kinetic parameters for peaks 4 and 5 determined from ancillary measurements resulting in nearly 'single-glow peak' curves for both the peaks. In the slow-cooled samples, owing to the increased relative intensity of peak 5a compared with the naturally cooled samples, the precision of the measurement of the 5a/5 intensity ratio is found to be ∼15% (1 SD) compared with ∼25% for the naturally cooled samples. The ratio of peak 5a/5 in the slow-cooled samples is found to increase systematically and gradually through a variety of radiation fields from a minimum value of 0.13±0.02 for (90)Sr/(90)Y low-ionisation density irradiations to a maximum value of ∼0.8 for 20 MeV Cu and I ion HID irradiations. Irradiation by low-energy electrons of energy 0.1-1.5 keV results in values between 1.27 and 0.95, respectively. The increasing values of the ratio of peak 5a/5 with increasing ionisation density demonstrate the viability of the concept of the peak 5a/5 nanodosemeter and its potential in the measurement of average ionisation density in a 'nanoscopic' mass containing the trapping centre/luminescent centre spatially correlated molecule giving rise to composite peak 5. |
| Databáze: | OpenAIRE |
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