Determination of fast neutron flux distribution in irradiation sites of the Malaysian Nuclear Agency research reactor

Determination of thermal to fast neutron flux ratio (ffast)(ffast) and fast neutron flux (ϕfast)(ϕfast) is required for fast neutron reactions, fast neutron activation analysis, and for correcting interference reactions. The ffastffast and subsequently ϕfastϕfast were determined using the absolute method. The ffastffast ranged from 48 to 155, and the ϕfastϕfast was found in the range 1.03×1010–4.89×1010 n cm−2 s−1. These values indicate an acceptable conformity and applicable for installation of the fast neutron facility at the MNA research reactor.