Computational study of the effect of sapphire neutron filter on reducing the neutron and secondary-gamma dose rate around the main shield of D channel in TRR

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Gholamzadeh Zohreh

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ISSN: 2588-4824

Journal Paper

Paper Information

Journal: Radiation Physics and Engineering Year:621 | Volume: | Issue: Page(s): 25-33

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Title

Computational study of the effect of sapphire neutron filter on reducing the neutron and secondary-gamma dose rate around the main shield of D channel in TRR

Author(s)

Gholamzadeh Zohreh | Issue Writer Certificate

Keywords

Neutron filterQ4

Neutron and gamma dose rateQ4

Sapphire crystalQ4

Tehran Research ReactorQ4

MCNPX simulationQ4

Benchmark studyQ4

Abstract

Simulation work provides valuable information on the behavior of different research reactor neutron analysis facilities. The present study considered neutron and secondary-gamma dose rate variations by applying a Sapphire crystal inside the D channel in Tehran Research Reactor (TRR). The MCNPX computational code was used to model the channel and its designed shield. Neutron and gamma dose rates distributions were calculated with a Sapphire crystal modeling to investigate the neutron diffraction facility hall dose rates. The data from the dose rate simulations were compared with the experimental data available at a power of 4.2 MW from the research reactor. The comparison showed that there is very good conformity between two data series. The simulated neutron dose rate in front of the main shield overestimated the measurement data by 57% in closed-shutter situation and underestimated the measured data by 32% in open-shutter measurement situation. The investigation has shown that adjusting the crystal size to the channel size is considerably effective, especially at high leakage positions.

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