Design, construction and characterization of a new neutron beam for neutron radiography at the Tehran Research Reactor

To obtain a thermal neutron beam for neutron radiography applications, a neutron collimator has been designed and implemented at the Tehran Research Reactor (TRR). TRR is a 5MW open pool light water moderated reactor with seven beam tubes. The neutron collimator is implemented in the E beam tube of...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2016-05, Vol.818, p.1-8
Main Authors: Choopan Dastjerdi, M.H., Khalafi, H., Kasesaz, Y., Mirvakili, S.M., Emami, J., Ghods, H., Ezzati, A.
Format: Article
Language:English
Subjects:
Activation
ASTM standard
Collimation
Collimator
MCNP
Neutron beams
Neutron radiography
Nuclear reactor components
Nuclear research reactors
Tehran Research Reactor
Thermal neutrons
Tubes
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Summary:To obtain a thermal neutron beam for neutron radiography applications, a neutron collimator has been designed and implemented at the Tehran Research Reactor (TRR). TRR is a 5MW open pool light water moderated reactor with seven beam tubes. The neutron collimator is implemented in the E beam tube of the TRR. The design of the neutron collimator was performed using MCNPX Monte Carlo code. In this work, polycrystalline bismuth and graphite have been used as a gamma filter and an illuminator, respectively. The L/D parameter of the facility was chosen in the range of 150–250. The thermal neutron flux at the image plane can be varied from 2.26×106 to 6.5×106ncm−2s−1. Characterization of the beam was performed by ASTM standard IQI and foil activation technique to determine the quality of neutron beam. The results show that the obtained neutron beam has a good quality for neutron radiography applications.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2016.02.040