Abstract
Monte Carlo N-Particle code (MCNP-5) was employed to simulate the neutron flux profile in a newly designed irradiation site surrounded by a graphite thermal column for Large Sample Neutron Activation Analysis, in the Ghana Research Reactor-1. The results shows that the average thermal neutron flux in the irradiation channel surrounded with 6cm thick graphite was 5.45×1010ncm−2s−1 as compared with 1.74×1010ncm−2s−1 when there is no graphite around the irradiation channel. This shows an increase in the thermal neutron flux in the irradiation channel by a factor of 3.13. The thermal neutron flux gradient decreased at 7.0×109ncm−2s−1 per cm to 3.90×107ncm−2s−1 per cm when the channel is surrounded by 6cm thick graphite which makes it very suitable for Large Sample Neutron Activation Analysis. The simulation agrees very well with the experimental keff of 1.00400 as compared with the final keff of 1.00390 recorded by this simulation.
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