MCNP simulation study of neutron stimulated emission computed tomography system based on D-T neutron source
2017
In this paper, Neutron Stimulated Emission Computed Tomography
(NSECT) system was simulated using MCNP software, including the selection
of Neutron source, the design of collimating shielding system, the
setting of shielding wall and target body, and the arrangement of
detector. The 14 MeV D-T Neutron source created by the Neutron generator
located at Lanzhou University, was delivered, collimated and hit a
cylindrical water phantom. We recorded and won the flux distribution
and typical spectrum of characteristic gamma-ray and outgoing Neutron.
This study has a guiding role for the detector layout during NSECT
imaging experiment. From the flux distribution and typical spectrum
of characteristic gamma-ray and outgoing Neutron, it is clearly shown
that the position of NSECT imaging detector should be placed from
43.6° to 50.9° along the Neutron beam propagation direction. The optimized
direction would be in 48.5°. From the characteristic gamma-ray spectrum,
we found the characteristic peaks of 16 O. This result suggests
that NSECT has the ability to identify elements and to determine the
element concentrations. This work also proved that NSECT could be
applied for the early diagnosis of cancer and the checking of hiding
explosives and drugs.
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