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Sci—Fri AM: Mountain — 03: Current status of the NRC primary standard for 192 Ir HDR brachytherapy sources
Author(s) -
MainegraHing E,
Downton Brad
Publication year - 2014
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.4894942
Subject(s) - brachytherapy , kerma , calibration , primary standard , detector , physics , offset (computer science) , optics , dosimetry , nuclear medicine , mathematics , statistics , computer science , medicine , programming language , radiation therapy
The Canadian primary standard for 192 Ir HDR brachytherapy sources has been recently revised in a more accurate manner allowing for more realistic uncertainty estimation. Air‐kerma strength S k is derived from measurements of the source's output using a graphite‐walled spherical ionization chamber (2S) at several distances. Traceability to NRC primary standards for the 192 Ir calibration coefficient N k is insured by estimating it as the inverse arithmetic mean of the inverse of the calibration coefficients for a 137 Cs beam and the medium energy x‐ray beam quality N250, both of which are traceable to NRC primary standards. The multiple‐distance method is combined with a non‐linear least squares fit to determine St, while at the same time removing the effects of room scatter and position offset. The previously used shadow‐cone method for directly measuring the room scatter is found to be inadequate due to the increased scatter contribution from the lead cone itself, especially at short source‐detector distances. Rather than including the reported 1% difference in source strength for 192 Ir HDR sources of different construction into the total uncertainty, users are cautioned that the calibration coefficient provided by NRC is only valid for a microSelectron V2 model. A comprehensive uncertainty budged shows that the total one sigma uncertainty of the standard is actually 0.6% rather than the previously assumed 1.2%. NRC measured S k agrees within 0.03% of the manufacturer's value.