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Radiation Protection Dosimetry Advance Access originally published online on September 23, 2006
Radiation Protection Dosimetry 2007 123(2):137-142; doi:10.1093/rpd/ncl107
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

X reference radiation qualities produced with tube voltages above 300 kV for the calibration and testing of dosemeters

U. Ankerhold

Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Corresponding author: ulrike.ankerhold{at}ptb.de

Received May 22, 2006, accepted July 30, 2006


  Abstract

In the international standard ISO 4037-1, only X reference radiation qualities produced with tube voltages of up to 300 kV and with mean photon energies of lower than 250 keV are defined. Higher energy reference photon fields are given with a mean energy only from 662 keV (S–Cs) upwards. To close this energy gap, four new X radiation qualities, produced with tube voltages of 350 kV and 400 kV, were realised. The filtration of two of these qualities—called N-350 and N-400—was chosen in such a way that they agree with the specifications of the narrow-spectrum series (N-series) defined in ISO 4037-1. The other qualities which have been created—called H-350 and H-400—can be assigned to the high air-kerma rate series (H-series). The fluence spectra of these qualities were measured by using X-ray spectrometry. The values of 23 characteristic parameters were determined and compared with the ISO specifications for X-ray reference fields.


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[Abstract] [Full Text] [PDF]


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