Comparison between the NIST and the KEBS for the Determination of Air kerma Calibration Coefficients for Narrow X-ray Spectra and Cs-137 Gamma-Ray Beams

Published

February 26, 2010

Author(s)

C M. O'Brien, Ronaldo Minniti, Stanslaus Masinza

Abstract

Air kerma calibration coefficients for a reference class ionization chamber from narrow x-ray spectra and cesium 137 gamma ray beams were compared between the National Institute of Standards and Technology (NIST) and the Kenya Bureau of Standards (KEBS). A NIST reference-class transfer ionization chamber was calibrated by each laboratory in terms of the quantity air kerma in four x-ray reference radiation beams of energies between 80 kV and 150 kV and in a cesium 137 gamma-ray beam. The reference radiation qualities used for this comparison are described in detail in the ISO 4037 publication.( ISO, 1996) The comparison began in September 2008 and was completed in March 2009. The results reveal the degree to which the participating calibration facility can demonstrate proficiency in transferring air kerma calibrations under the conditions of the said facility at the time of the measurements. The comparison of the calibration coefficients is based on the average ratios of calibration coefficients.

Citation

Journal of Research (NIST JRES) -

Volume

115

NIST Pub Series

Journal of Research (NIST JRES)

Pub Type

NIST Pubs

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Keywords

air-kerma, free-air ionization chamber, primary standard, reference radiation qualities, x-ray calibration, gamma-ray, cesium 137

Citation

O'Brien, C. , Minniti, R. and Masinza, S. (2010), Comparison between the NIST and the KEBS for the Determination of Air kerma Calibration Coefficients for Narrow X-ray Spectra and Cs-137 Gamma-Ray Beams, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903106 (Accessed December 21, 2024)