Abstract
The thermal neutron flux has been measured radially around a duct consisting of two parts of different radii pierced in the center of an ilmenite concrete assembly. The concrete assembly has dimensions of 120 × 120 × 120 cm 3 and was arranged in front of one of the horizontal channels of the ET-RR-1 reactor. The presence of this air filled duct in the ilmenite concrete shield causes a relative increase in the neutron flux compared with that for solid ilmenite concrete. The difference in radii between the two parts of the air-filled duct causes a peak in the thermal neutron flux at a distance ≈10 cm from the second part of the duct which has the smaller radius. This increase in thermal neutron flux becomes more as the difference between the radii of the two parts of the duct increases It was found that the duct effect K E φ ducted φ solid increases with an increase in the difference between the radii of the two parts of the duct. An empirical formula has been derived to describe the radial attenuation of thermal neutrons. It can be fitted to the measured data within a factor (0.3–1.3).
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Schedule a callMore From: International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes
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