Comparison of 192lr air kerma calibration coefficients derived at ARPANSA using the interpolation method and at the National Physical Laboratory using a direct measurement

Butler, D, Haworth, A, Sander, T and Todd, S 2008, 'Comparison of 192lr air kerma calibration coefficients derived at ARPANSA using the interpolation method and at the National Physical Laboratory using a direct measurement', Australasian Physical and Engineering Sciences in Medicine, vol. 31, no. 4, pp. 332-338.


Document type: Journal Article
Collection: Journal Articles

Title Comparison of 192lr air kerma calibration coefficients derived at ARPANSA using the interpolation method and at the National Physical Laboratory using a direct measurement
Author(s) Butler, D
Haworth, A
Sander, T
Todd, S
Year 2008
Journal name Australasian Physical and Engineering Sciences in Medicine
Volume number 31
Issue number 4
Start page 332
End page 338
Total pages 7
Publisher Australasian College of Physical Scientists and Engineers in Medicine
Abstract The reference air kerma rate from 192Ir High Dose Rate (HDR) brachytherapy sources can be measured using a suitably calibrated Farmer chamber and an appropriate in-air calibration jig. When a primary standard for 192Ir gamma rays is available, a calibration coefficient for the chamber and jig combination can be determined directly. In Australia, due to the absence of such a standard, the chamber must be calibrated by interpolation of the response in 60Co and in a kilovoltage x-ray beam. Corrections for the effect of the jig, scatter and beam non-uniformity must then be measured or calculated before the reference air kerma rate can be determined. We compare the air-kerma calibration coefficient of a PTW 30010 PMMA/A1 Farmer chamber (referred to as Farmer chamber throughout this report) obtained from the 192Ir primary standard at the National Physical Laboratory in the UK with the corresponding coefficient obtained by interpolating Australian calibrations using 60Co and 250 kV x-rays and determining suitable correction factors. The resulting chamber/jig calibration coefficients differ by 0.2% which is well within the combined standard uncertainties of 1.2% and 0.6% reported by ARPANSA and NPL respectively.
Subject Medical Devices
Copyright notice © 2008 ACPSEM.
ISSN 0158-9938
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