[SLAC Pubs and Reports]
Calculation of Photoneutrons from Varian Clinac Accelerators and Their Transmissions in Materials
Monte Carlo calculations of the giant-dipole-resonance photoneutrons (GRN) around the Varian
Clinac 2100C/2300C medical accelerator heads (10-20 MV modes) were made using the coupled
EGS4-MORSE code. The actual head materials and geometries were simulated in great detail using the Combinatorial
Geometry facility of MORSE. The neutron production (i.e., sites and yields) was calculated with EGS4 and,
then, the neutron transport in the accelerator head was done with MORSE. Both the evaporation and direct
neutron components of the GRN were considered by incorporating the EVAP4 code and an empirical
algorithm, respectively, into MORSE. With the calculated neutron spectra around the head as source terms,
MCNP4a was used to estimate the corresponding dose equivalent transmission (considering both the neutron
attenuation and the build-up of captured gamma rays) in several different types of concrete. The calculated
results of the absolute neutron fluence and spectra around the heads, as well as the transmission curves, are
presented and discussed.
Not available for this document.
Full bibliographic data for this document, including its complete author list,
is (or soon will be) available from SLAC's
Please report problems with this file to
The SLAC preprint inventory is provided by the
SLAC Technical Publications Department.
Page generated 13 Nov 2006 @ 12:19 PST by htmlme.pl