Development of fast neutron radiography system based on portable neutron generator

Yi, Chia; Nilsuwankosit, Sunchai

doi:10.1063/1.4940076

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Neutron Generators (NG) are extensively used in the various industrial applications such as neutron radiography [1,2], neutron activation analysis [3][4][5], boron neutron capture therapy [6][7][8], explosive material detection [9,10] and material testing [11].…”

Section: Introductionmentioning

confidence: 99%

MCNP Dose evaluation around D-D and D-T neutron generators and shielding design

2021

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In recent years, neutron generators have extensively used as neutron sources and vast efforts have been made to develop high yield neutron generators, so the aspect of radiation shielding during the utilization of neutron generators is unavoidable. In this study, dose distribution around the D-D and D-T neutron generator was calculated by using Monte Carlo simulation. Then an effective shielding was designed and different materials with different thicknesses at distinction distances from the generator were examined. Finally, the organs dose was acquired by using ICRP 110 male phantom with and without shielding at different body position relative to generator tube.The results show that the dose induced by the D-T generator is 500 times greater than the D-D generator and the neutron dose is about 100 times more than gamma dose. The dose is reduced about 20 times by increasing the distance up to 5 m, however, the presence of Borated-Polyethylene with a thickness of 60 cm as most effective shielding reduces the whole-body dose up to 60%. Besides, inserting a layer of Pb to Borated-Polyethylene is effective to attenuate the gamma-rays. The received dose to organs depends on the body direction relative to tube head of neutron generator. In general, the best position of tube placement relative to shielding wall are 90 and 180 degrees for the D-T and D-D generators, respectively, distance between the generator tube head and the phantom is suggested 200 cm and it is recommended that for most dose reduction, the operator stands in the anterior-posterior position relative to generator tube. K: Dosimetry concepts and apparatus; Models and simulations; Radiation damage evaluation methods; Neutron sources

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