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Radiation Protection Dosimetry 2004 110(1-4):129-134; doi:10.1093/rpd/nch189
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Measurement and Monte Carlo modelling of the JRC 241Am–Li({alpha},n) source spectrum

H. Tagziria1, B. Wiegel2, H. Klein2, K. Knauf2, J. Wittstock2 and A. Zimbal2

1 The European Commission, Joint Research Centre, I-21020 Ispra (VA), Italy
2 Physikalisch-Technische Bundesanstalt, D-38116, Braunschweig, Germany

Corresponding author: hamid.tagziria{at}irc.it

The neutron energy spectrum of the JRC 241Am–Li({alpha},n) radionuclide source has been measured at the PTB in Germany using various spectrometry systems, such as Bonner spheres, proton recoil counters and NE213 liquid scintillators. The source photon spectrum has been measured and the neutron contamination due to traces of beryllium through the 9Be({alpha},n)12C reaction has been determined. The effects associated with source encapsulation and the materials it contains have been investigated previously, using Monte Carlo simulations, the various structures seen in the spectra have been explained and the anisotropy of fluence distributions in 4{pi} have been calculated and compared to measurements. These extensive high resolution spectrometry measurements have been coupled to Monte Carlo calculations to provide a realistic spectrum and new spectrum-averaged fluence-to-dose equivalent conversion coefficients for the actual 241Am–Li source.


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