By analysing the neutron rates measured using multiple fission-chamber (FC) diagnostics—constituting a FC array (FCA)–the spatial distribution of fusion reaction rates within a tokamak may be studied. Using the two-FC set-up at Mega-Ampere Spherical Tokamak Upgrade, analysis methods are presented for both the study of poloidal neutron emissivity distributions and neutral-beam injection shine-through measurements. Different FCA configurations are also proposed, with the possible future uses for these diagnostics discussed.