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Optimisation of an EPR dosimetry system for robust and high precision dosimetry |
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| Institution: | 1. Department of Radiation Physics and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden;2. Swedish Radiation Safety Authority, Stockholm, Sweden, and Radiation Physics, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden;3. Radiation Physics, Department of Medicine and Health Sciences, Linköping University, Linköping, Sweden;4. Department of Medical Techniques (MTÖ) and Radiation Physics, Department of Medicine and Health Sciences, Linköping University, Linköping, Sweden;1. Chemical Sciences & Engineering Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439, United States;2. Physics Department, South Dakota School of Mines & Technology, 501 E. Saint Joseph St., Rapid City, SD 57701, United States;3. Idaho Accelerator Center, Idaho State University, 921 S. 8th Ave., Pocatello, ID 83209, United States;1. Radiation Laboratory, Institute of Industrial Ecology, UB RAS, Ekaterinburg, Russia;2. Department of Experimental Physics, Ural Federal University, Ekaterinburg, Russia;3. Institute of Electrophysics, UB RAS, Ekaterinburg, Russia;1. Cukurova University, Arts-Sciences Faculty, Physics Department, 01330 Adana, Turkey;2. CIEMAT, Av. Complutense 22, 28040 Madrid, Spain;3. Museo Nacional de Ciencias Naturales, (CSIC), C/José Gutiérrez Abascal 2, 28006 Madrid, Spain;1. Department of Radiation Convergence Engineering, iTOMO Group, Yonsei University, Wonju 26493, Republic of Korea;2. Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD 21201, USA |
| Abstract: | Clinical applications of electron paramagnetic resonance (EPR) dosimetry systems demand high accuracy causing time consuming analysis. The need for high spatial resolution dose measurements in regions with steep dose gradients demands small sized dosimeters. An optimization of the analysis was therefore needed to limit the time consumption. The aim of this work was to introduce a new smaller lithium formate dosimeter model (diameter reduced from standard diameter 4.5 mm to 3 mm and height from 4.8 mm to 3 mm). To compensate for reduced homogeneity in a batch of the smaller dosimeters, a method for individual sensitivity correction suitable for EPR dosimetry was tested. Sensitivity and repeatability was also tested for a standard EPR resonator and a super high Q (SHQE) one. The aim was also to optimize the performance of the dosimetry system for better efficiency regarding measurement time and precision. A systematic investigation of the relationship between measurement uncertainty and number of readouts per dosimeter was performed. The conclusions drawn from this work were that it is possible to decrease the dosimeter size with maintained measurement precision by using the SHQE resonator and introducing individual calibration factors for dosimeter batches. It was also shown that it is possible reduce the number of readouts per dosimeter without significantly decreasing the accuracy in measurements. |
| Keywords: | EPR ESR Lithium formate High precision dosimetry High spatial resolution dosimetry |
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