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Radiation Protection Dosimetry Advance Access originally published online on August 12, 2006
Radiation Protection Dosimetry 2007 123(1):122-127; doi:10.1093/rpd/ncl087
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

TECHNICAL NOTES

Consideration on calibration and correction factors of an HP(10) chamber for different radiation qualities and angles of incidence

S. Mikami1,*, C. Itié2 and C. Texier2

1 Japan Atomic Energy Agency (JAEA), 4-33 Muramatsu, Tokai-mura, Naka-gun, Ibaraki-Pref. 319-1194, Japan
2 Institute for Radiation Protection and Nuclear Safety (IRSN), B.P.17, F-92262 Fontenay-aux-Roses, France

* Corresponding author: mikami.satoshi{at}jaea.go.jp

Received June 28, 2005, amended May 2, 2006, accepted June 4, 2005


  Abstract

This paper presents the characterisation performed at IRSN (France) of an Hp(10) chamber in terms of calibration coefficient and correction factors for the radiation qualities of ISO narrow spectrum series. The chamber response, expressed in Hp(10) using conversion coefficients hpK(10; N, {alpha}) listed in ISO 4037-3 in the energy range from 30 to 1250 keV and for angles of incidence between 0 and 70°, was found to be within ~10%. However, for photon energies <30 keV, an overresponse of the chamber that could reach 100% was observed. Nevertheless, this overresponse was reduced to 25% using the conversion coefficients estimated at Physikalisch-Technische Bundesanstalt (PTB). This implies that the X-ray spectra produced by the IRSN X-ray units are very similar to those produced by PTB, both containing a little bit more high-energy photons than the spectra used in ISO 4037-3. The dose rate dependence of the chamber tested by gamma radiation from 60Co sources was found to be within 2% in the range of 0.3 mSv h–1 to 1 Sv h–1. The Hp(10) chamber can measure directly the conventional true value of Hp(10) after calibration by a reference laboratory, and can be used for transferring Hp(10) reference quantities from a reference laboratory.


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