Possibility of elastico-mechanoluminescence dosimetry using alkali halides and other crystals |
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| Institution: | 1. School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur 492010, Chhattisgarh, India;2. Department of Electrical and Electronics Engineering, Chhatrapati Shivaji Institute of Technology, Shivaji Nagar, Kolihapuri, Durg 491001, Chhattisgarh, India;3. Department of Applied Physics, Raipur Institute of Technology, Chhatauna, Mandir Hasuad, Raipur 492101, Chhattisgarh, India;4. Department of Applied Physics, Shri Shankaracharya College of Engineering & Technology, Bhilai, Chhattisgarh, India;1. Clinical Research Center, the Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, 210003, China;2. Department of Cell and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, 70 President Street, DDB410, Charleston, SC, 29425, USA;3. GenScript Biotech, Nanjing, 210003, China;4. Nanjing Infectious Disease Center, the Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, 210003, China;5. Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore;6. Department of Radiology, the Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, 210003, China;7. Department of Laboratory Medicine, Nanjing Red Cross Blood Center, Nanjing, 210003, Jiangsu, China;8. Department of Clinical Laboratory, the Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, 210003, China;9. Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, 211166, China;1. SoS in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur (C.G.) 492010 India;2. Department of Physics, C.V. Raman Global University, Bhubaneswar, Odisha 752054, India;3. M. J. College, Kohka, Junwani Road, Bhilai, Dist., Durg C. G. 490023, India;1. Department of Applied Physics, Raipur Institute of Technology, Chhatauna, Mandir Hasaud, Raipur 492101, India;2. Department of Physics, National Institute of Technology, GE Road, Raipur 492010, India;3. Department of Postgraduate Studies and Research in Physics and Electronics, Rani Durgavati University, Jabalpur 482001, India;4. Department of Electrical and Electronics Engineering, Chhatrapati Shivaji Institute of Technology, Shivaji Nagar, Kolihapuri, Durg 491001, India;1. Department of Applied Chemistry and Biotechnology, National Institute of Technology, Niihama College, Niihama, Japan;2. Material and Biological Chemistry, Graduate School of Science and Engineering, Yamagata University, Yamagata, Japan |
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| Abstract: | The elastico-mechanoluminescence (EML) intensity of X or γ-irradiated alkali halide crystals can be used in radiation dosimetry. The EML intensity of X or γ-irradiated alkali halide crystals increases linearly with the strain of the crystals, and when the crosshead of the testing machine deforming an X or γ-irradiated crystal is stopped, then the EML intensity decreases with time. The semilog plot of the EML intensity versus (t − tc) (where tc is the time where the crosshead of the testing machine is stopped) indicates that, in the post-deformation region, the EML intensity initially decreases exponentially at a fast rate and later on it decreases exponentially at a slow rate. The EML intensity increases linearly with the density of the F-centres in the crystals. This fact indicates that elastico-ML can suitably be used for the radiation dosimetry. The EML spectra of X or γ-irradiated alkali halide crystals are similar to their thermoluminescence spectra. Based on the detrapping of electrons during the mechanical interaction between the dislocation segments and F-centres, an expression is derived, which indicates that the EML intensity should increase linearly with the density of F-centres in the crystals. The expression derived for the decay of EML indicates that the decay time for the fast decrease of EML should gives the pinning time of dislocation segments (lifetime of interacting F-centres), and the decay time for the slow decrease of EML intensity should gives the lifetime of electrons in the shallow traps. As the elastic deformation is non-destructive phenomenon and the EML intensity depends on the radiation dosage given to the alkali halide crystals, similar to the thermoluminescence and photo-stimulated luminescence, the EML of alkali halide crystals and other crystals may be used for the radiation dosimetry. In EML dosimetry, the same crystal can be used number of times because the elastic deformation does not cause permanent deformation in the crystals, and moreover, comparatively the devices needed for the EML measurements are of low cost and very simple. In recent years, a large number of elastico mechanoluminescent materials have been investigated, and the study of their suitability for the radiation dosimetry may be interesting. |
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| Keywords: | Mechanoluminescence Triboluminescence Dosimetry Coloured alkali halide crystals Elastic deformation Radiations |
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