Application of Imaging Plate to Measurement of Radiation Spatial Distribution

Abstract

An imaging plate (IP) was applied to 1) detecting of low-level contamination that was difficult to detect by a conventionalway, 2) measurement of spatial distributions of thermal neutrons and 3) profile measurement of fast neutronsand proton beam of low intensity. For 1), a large-size IP (BAS-Ills) was disposed to the sample, and the position andintensity of the contamination was identified unambiguously by scanning IP. For 2), activation foils were combinedwith IP to avoid 7-rays from neutron sources and radioactive accelerator components. We placed small gold activationfoils at many points of interest in an accelerator room and disposed them on IP after irradiation. This method enables tomeasure neutron spatial distribution in a single scanning. We extended this method to profiling of fast neutron by usingan aluminum plate and proton beams with intensity too low to measure by beam current but too strong to measure bypulse counting by using a thin copper foil.