A comparison of Australian and Canadian calibration coefficients for air kerma and absorbed dose to water for 60Co γ radiation

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TypeArticle
Journal titleAustralasian physical and engineering sciences in medicine
ISSN0158-9938
Volume29
Issue2
Pages206215; # of pages: 10
AbstractAustralian and Canadian calibration coefficients for air kerma and absorbed dose to water for60Co gamma radiation have been compared using transfer standard ionization chambers of types NE 2561 and NE 2611A. Whilst the primary standards of air kerma are similar, both being thick-walled graphite cavity chambers but employing different methods to evaluate the Awall correction, the primary standards of absorbed dose to water are quite different. The Australian standard is based on measurements made with a graphite calorimeter, whereas the Canadian standard uses a sealed water calorimeter. The comparison result, expressed as a ratio of calibration coefficientsR=N ARPANSA /N NRC , is 1.0006 with a combined standard uncertainty of 0.35% for the air kerma standards and 1.0052 with a combined standard uncertainty of 0.47% for the absorbed dose to water standards. This demonstrates the agreement of the Australian and Canadian radiation dosimetry standards. The results are also consistent with independent comparisons of each laboratory with the BIPM reference standards. A ‘trilateral’ analysis confirms the present determination of the relationship between the standards, within the 0.09% random component of the combined standard uncertainty for the three comparisons.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedNo
Identifier10170273
NRC number3543
NPARC number8896967
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Record identifierac4c7600-70c2-4641-82df-c780624be133
Record created2009-04-22
Record modified2016-05-09
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