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Radiation Protection Dosimetry 2005 116(1-4):95-98; doi:10.1093/rpd/nci129
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Radioprotection calculations for MEGAPIE

L. Zanini*

Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

* Corresponding author: Luca.Zanini{at}psi.ch

The MEGAwatt PIlot Experiment (MEGAPIE) liquid lead–bismuth spallation neutron source will commence operation in 2006 at the SINQ facility of the Paul Scherrer Institut. Such an innovative system presents radioprotection concerns peculiar to a liquid spallation target. Several radioprotection issues have been addressed and studied by means of the Monte Carlo transport code, FLUKA. The dose rates in the room above the target, where personnel access may be needed at times, from the activated lead–bismuth and from the volatile species produced were calculated. Results indicate that the dose rate level is of the order of 40 mSv h–1 2 h after shutdown, but it can be reduced below the mSv h–1 level with slight modifications to the shielding. Neutron spectra and dose rates from neutron transport, of interest for possible damage to radiation sensitive components, have also been calculated.


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