A new EPR dosimeter based on 2:1 mixture of Li2C2O4:Na2C2O4 for gamma and neutron dosimetry |
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| Authors: | T.S. Sudheer S. Murali M.K. Bhide A.G. Page |
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| Affiliation: | 1. Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;2. Radio Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;3. Center of Excellence for Infectious Diseases, Department of Biomedical Sciences, Texas Tech University Health Sciences Center, El Paso, Texas 79905;4. the Bioinformatics Institute, Agency for Science, Technology and Research, Singapore 138671, Singapore;5. the Department of Infectious Disease, Tan Tock Seng Hospital, Singapore 308433, Singapore;6. the School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore;1. Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;2. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba 305-8568, Japan;1. Engineering Materials Institute, School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, NSW 2500, Australia;2. Institute for Superconducting & Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia;3. Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia |
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| Abstract: | Electron paramagnetic resonance (EPR) investigations of Li2C2O4, Na2C2O4 mixed in proportion 1:0, 0:1, 1:1, 2:1 and 3:1 were carried out to measure the absorbed dose from photons and thermal neutrons in a mixed radiation field. A single line spectrum of CO2? radical anion centered around g=2.0045±0.0005 was obtained in the respective cases on gamma and neutron irradiation. Except Na2C2O4, other mixtures had shown increase in line width on neutron irradiation possibly due to relaxation effects. Of all combinations, the 2:1 mixture is the more sensitive material for gamma and thermal neutrons. Intensity of CO2? radical signal in 2:1 Li2C2O4:Na2C2O4 mixture was found to be linear from 0.006 to 11 kGy for gamma and 40–1530 kGy for thermal neutron doses. Radical signal was found to be stable over a period of 300 days with marginal fading of less than 1 percent. Experimental results thus obtained suggest 2:1 Li2C2O4:Na2C2O4 mixture as the potential neutron dosimeter for medium and high dose range. |
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