The dose and X-ray energy response of LiF:Mg,Cu,P and CaSO4:Dy thermoluminescent foils |
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| Affiliation: | 1. Institute for Computational Mechanics and Its Applications (NPUiCMA), Northwestern Polytechnical University, Xi’an, Shaanxi, China;2. Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8505, Japan;3. JST CREST, Gobancho 7, Chiyoda-ku, Tokyo 102-0076, Japan;1. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe Shosse, 31, Moscow, 115409, Russian Federation;2. State Research Center of the Russian Federation – Institute for Biomedical Problems, Russian Academy of Sciences, Khoroshevskoye Shosse, 76A, Moscow, 123007, Russian Federation;3. Radiation Measurement Research Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan;1. Faculty of Engineering and Technology, Multimedia University, 75450 Malacca, Malaysia;2. Physics Section, School of Distance Education, Universiti Sains Malaysia, 11800 Penang, Malaysia;3. Faculty of Engineering, Multimedia University, 20100 Cyberjaya, Selangor, Malaysia;4. Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Krakow, Poland;5. Department of Imaging, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;6. Photonics Research Group, Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;7. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;8. Telekom Research & Development Sdn. Bhd, Idea Tower, UPM-MTDC, Technology Incubation Center One, Lebuh Silikon, 43400 Serdang, Selangor, Malaysia;9. Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom;10. Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia;11. Department of Physics, College of Science, Al Imam Mohammad Bin Saud Islamic University, Riyadh 11623, Saudi Arabia |
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| Abstract: | Within a systematic study of a novel system enabling 2D readout of TL foils, the X-ray energy and dose response was investigated in TL foils containing LiF:Mg,Cu,P (MCP-N) or CaSO4:Dy as activators. Foils were exposed to broad X-ray beams of mean energies ranging between 45 keV and 208 keV (ISO 4037 standard), with reference to 662 keV 137Cs gamma rays. The MCP-N foils, of about 380 nm emission wavelength, show a flat X-ray energy response, but low sensitivity. Due to poor TL light detection efficiency of the CCD (charge-coupled device) camera over this range of wavelengths, only doses exceeding 500 mGy can be reliably measured. In the case of CaSO4:Dy foils, their TL light emitted around 450 nm wavelengths is registered by the CCD camera with no loss of efficiency, enabling X-ray doses as low as 100 mGy to be evaluated. Unlike that of MCP-N, the dose response of CaSO4:Dy foils is highly supralinear. Nevertheless, within experimental conditions applied in this study, the 2D-TL technique may be applied to determine Entrance Surface Dose or Maximum Skin Dose in radiology. The more sensitive CaSO4:Dy foils could be used only in a well-specified radiation field (e.g., in mammography) or in qualitative dose mapping. |
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| Keywords: | 2 D thermoluminescence Skin dose measurements in radiology |
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