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Radiation Protection Dosimetry 2005 115(1-4):200-206; doi:10.1093/rpd/nci254
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Calculations of neutron and photon source terms and attenuation profiles for the generic design of the SPEAR3 storage ring shield

S. H. Rokni*, H. Khater, J. C. Liu, S. Mao and H. Vincke

Radiation Protection Department, Stanford Linear Accelerator Center, PO Box 4349, Stanford, CA 94309, USA

* Corresponding author: rokni{at}slac.stanford.edu

The FLUKA Monte Carlo particle generation and transport code was used to calculate shielding requirements for the 3 GeV, 500 mA SPEAR3 storage ring at the Stanford Synchrotron Radiation Laboratory. The photon and neutron dose equivalent source term data were simulated for a 3 GeV electron beam interacting with two typical target/shielding geometries in the ring. The targets simulated are a rectangular block of 0.7 cm thick copper and a 5 cm thick iron block, both tilted at 1° relative to the beam direction. Attenuation profiles for neutrons and photons in concrete and lead as a function of angle at different shield thicknesses were calculated. The first, second and equilibrium attenuation lengths of photons and neutrons in the shield materials are derived from the attenuation profiles. The source term data and the attenuation lengths were then used to evaluate the shielding requirements for the ratchet walls of all front-ends of the SPEAR3 storage ring.


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