An improved fast neutron radiography quantitative measurement method

The validity of a fast neutron radiography quantification method, the E-scaling method, which was originally proposed for thermal neutron radiography was examined with Monte Carlo calculations and experiments conducted at the YAYOI fast neutron source reactor. Water and copper were selected as comparative samples for a thermal neutron radiography case and a dense object, respectively. Although different characteristics on effective macroscopic cross-sections were implied by the simulation, the Sigma-scaled experimental results with the fission neutron spectrum cross-sections were well fitted to the measurements for both the water and copper samples. This indicates that the Sigma-scaling method could be successfully adopted for quantitative measurements in fast neutron radiography. (C) 2004 Elsevier B.V. All rights reserved.