Commissioning of the Canadian Primary Standard for Low Dose Rate Brachytherapy
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The purpose of this project is to investigate the performance of the NRC WAFAC and commission it as a primary standard. Significant enhancements were implemented to improve signal to noise ratio, measurement reproducibility and to eliminate electric field distortion. Validation of the ionization chamber was then carried out with a low-energy X-ray beam (31 keV) where the air kerma rate had been previously established using the existing NRC primary standard free-air chamber. Agreement between the two devices was obtained within the combined measurement uncertainties of less than 0.5 %. Measurements were also made with a 125I LDR seed and these gave results that were consistent at the 1 % level with the manufacturer's stated seed activity (traceable to NIST).The overall standard uncertainty in the determination of air kerma strength using the NRC WAFAC is estimated to be 3 %, which reaches the target uncertainty for the standard.
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Copyright © 2016 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2016
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shen-commissioningofthecanadianprimarystandard.pdf | 2023-05-05 | Public | Download |