The photo-transferred thermoluminescence phenomenon in case of emergency dose assessment

A major disadvantage of dose reconstruction by means of thermoluminescence (TL) is the fact that during readout of any TL material exposed to ionizing radiation (i.e., during measuring the glow curve), the radiation-induced signal gets lost. Application of the photo-transferred thermoluminescence ph...

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Bibliographic Details
Published in:Radiation and environmental biophysics 2020-05, Vol.59 (2), p.331-336
Main Authors: Wrzesień, Małgorzata, Al-Hameed, Hiba, Albiniak, Łukasz, Maciocha-Stąporek, Joanna, Biegała, Michał
Format: Article
Language:English
Subjects:
Annealing
Biological and Medical Physics
Biophysics
Dosimetry
Ecosystems
Effects of Radiation/Radiation Protection
Electron traps
Emergencies
Environmental Physics
Exposure
Glow curves
Heating
Ionizing radiation
Irradiation
Lithium fluoride
Monitoring/Environmental Analysis
Nuclear physics
Original
Original Article
Particle Accelerators
Physics
Physics and Astronomy
Radiation effects
Radiation measurement
Sensors
Temperature
Thermoluminescence
Thermoluminescent Dosimetry - methods
Ultraviolet radiation
Ultraviolet Rays
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Summary:A major disadvantage of dose reconstruction by means of thermoluminescence (TL) is the fact that during readout of any TL material exposed to ionizing radiation (i.e., during measuring the glow curve), the radiation-induced signal gets lost. Application of the photo-transferred thermoluminescence phenomenon (PTTL) may offer a solution to this problem. In PTTL, the residual signal that is not destroyed by conventional TL readout (because it comes from deeper electron traps) can be readout through simultaneous stimulation by UV light and heating, allowing to obtain information about the absorbed dose in a second run. The present paper describes the application of PTTL for emergency dose assessment. For this, MTS-N thermoluminescent detectors (LiF: Mg, Ti) were exposed using a high-energy Clinac 2300 medical linear accelerator to doses of 100 mGy, 300 mGy, 500 mGy, 700 mGy and 1000 mGy. Irradiation with UV radiation allowed the determination of the optimal heating time of 3 h, while the optimal temperature was identified to be 70 °C. The results obtained demonstrated the usefulness of the PTTL method for emergency dose assessment. The efficiency of the PTTL method was determined as 19%. Finally it was found that the detector background after UV exposure should not be underestimated during routine dose measurements.
ISSN:0301-634X
1432-2099
DOI:10.1007/s00411-020-00834-1