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Radiation Protection Dosimetry Advance Access originally published online on June 6, 2007
Radiation Protection Dosimetry 2007 126(1-4):413-417; doi:10.1093/rpd/ncm085
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Measurement of the spectral fluence rate of reference neutron sources with a liquid scintillation detector

A. Zimbal*

Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany

* Corresponding author: andreas.zimbal{at}ptb.de

Reference neutron sources such as 241AmBe({alpha},n) and 252Cf are commonly used to calibrate neutron detectors for radiation protection purposes. The calibration factors of these detectors depend on the spectral distribution of the neutron fluence from the source. Differences between the spectral fluence of the neutron source and the ISO-recommended reference spectra might be caused by the properties of the individual source. The spectral neutron fluence rates of different reference neutron sources used at PTB were measured with a liquid scintillation detector (NE213), using maximum entropy unfolding and a new, experimentally determined detector response matrix. The detector response matrix was determined by means of the time-of-flight technique at a pulsed neutron source with a broad energy distribution realised at the PTB accelerator facility. The results of the measurements of the reference sources are compared with the ISO-recommended reference spectra. For the PTB 241AmBe({alpha},n) reference source, the spectral neutron fluence was determined by means of a high-resolution 3He semiconductor sandwich spectrometer in 1982. These measurements were the basis for the ISO recommendations. The current measurements confirm the high-energy part (En > 2 MeV) of this spectrum and demonstrate the suitability of this new method for high-resolution spectrometry of broad neutron spectra.


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