4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
Paper Review: Initial screening in progress
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MCNPX based Radiation Shielding Analysis for the Mineral-PET Kimberlite Sorting Facility

Presented by Mr. Eric CHINAKA on 6 Jul 2016 from 16:10 to 18:00
Type: Poster Presentation
Track: Track F - Applied Physics
Board #: F.508

Abstract

Radiation shielding analysis and optimization calculations have been performed to design a shield for the mineral-PET (Positron Emission Tomography) facility. PET is a nuclear imaging technique currently used in diagnostic medicine. The technique is based on the detection of 511 keV coincident and co-linear photons produced from the annihilation of a positron (produced by a positron emitter) and a nearby electron. The technique is being developed for the run-of-mine detection of diamonds in Kimberlite rock. In the technique, a 40 MeV electron beam irradiates a bremsstrahlung target, producing a photon beam which irradiates the candidate rock to activate the naturally occurring 12C, thus producing a positron emitter 11C isotope via the photo-nuclear (γ,n) reaction. The resultant high intensity and high energy radiation (including both photons and neutrons) field requires appropriate shielding to protect personnel, equipment and the environment around the facility. Calculations to simulate the radiation field and to optimize the required shielding materials and their geometry were done using a Monte Carlo based radiation transport code, MCNPX-2.70. The optimized shield configuration as well as the associated neutron and photon dose rates on the personnel side of the shield are presented.

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Location: Kramer Law building
Address: UCT Middle Campus Cape Town
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