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Radiation Protection Dosimetry Advance Access originally published online on June 4, 2007
Radiation Protection Dosimetry 2007 124(2):103-106; doi:10.1093/rpd/ncm002
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Characteristics of a 85Kr beta-particle source applied in Series 1 reference irradiations of TMDIS-1 direct ion storage dosemeters

A.T. Hakanen1,*, P.M. Sipilä1 and T.T. Sahla2

1 STUK–Radiation and Nuclear Safety Authority, PO Box 14, FI-00881 Helsinki, Finland
2 Rados Technology Oy—Synodys Group, PO Box 506, FI- 20101 Turku, Finland

* Corresponding author: arvi.hakanen{at}stuk.fi

Received November 4, 2006, amended December 2, 2006, accepted December 16, 2006

Characteristics necessary to specify an ISO 6980 Series 1 reference radiation field were determined for a commercially available 85Kr beta-particle source, using a BEAM EGS4 Monte Carlo code. The characteristics include residual maximum beta energy, Eres, and the uniformity of the dose rate over the calibration area. The Eres and the uniformity were also determined experimentally, using an extrapolation ionization chamber (EC) and a 0.2 cm3 parallel plate ionization chamber, respectively. The depth-dose curve measured with the EC gave a value 0.62 MeV for the Eres. Series 2 90Sr + 90Y and Series 185 Kr beta-particle sources calibrated for Hp(0.07) at the secondary standard dosimetry laboratory (SSDL) of STUK were used to determine the energy and angular responses of TMDIS-1 direct ion storage dosemeters. The averaged zero angle Hp(0.07) responses to the 90Sr + 90Y and 85Kr reference radiations were 135 and 80%, respectively. The responses were normalized to 100%, Hp(0.07) response to 137Cs photon radiation.


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