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.
journal_name
Australas Phys Eng Sci Medjournal_title
Australasian physical & engineering sciences in medicineauthors
Butler D,Haworth A,Sander T,Todd Sdoi
10.1007/BF03178603subject
Has Abstractpub_date
2008-12-01 00:00:00pages
332-8issue
4eissn
0158-9938issn
1879-5447journal_volume
31pub_type
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