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Radiation Protection Dosimetry Advance Access originally published online on May 12, 2007
Radiation Protection Dosimetry 2007 126(1-4):482-486; doi:10.1093/rpd/ncm097
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Calibration of personal dosemeters in mixed neutron–photon fields: some problems and their solution

H. Schuhmacher*, R. Nolte, B. Wiegel and A. Zimbal

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

* Corresponding author: helmut.schuhmacher{at}ptb.de

In neutron reference radiation fields, the conventional true value of the personal dose equivalent, Hp(10), is derived from the spectral neutron fluence and recommended conversion coefficients. This procedure requires the phantom on which the personal dosemeter is mounted to be irradiated with a broad and parallel beam. In many practical situations, the change of the neutron fluence and/or the energy distribution over the surface of the phantom may not be neglected. For a selection of typical irradiation conditions in neutron reference radiation fields, the influence of this effect has been analysed using numerical methods. A further problem, which is of relevance for the calibration of dosemeters measuring both the neutron and the photon component of mixed fields, is the ‘double counting’ of the dose equivalent due to neutron-induced photons. The relevance of this conceptual problem for calibrations in mixed-field dosimetry was analysed.


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