Cold Neutron Beam Hole In KUR And Its Radiography Tests

Abstract

Cold neutron radiography (CNR) was carried out for the performance tests of the cold neutron guide (CN-2) in Kyoto University Reactor (KUR). The beam intensity and the spatial distribution of it were measured with a conventional film method. A micro-densitometer with high precision was used for reading the film density. The peak intensity of the cold neutron beam was 1.1x10^7 n cm^-2 s^-1 as "thermal neutron intensity equivalent" at the exit spot of the CN-2 guide tube. Stripes pattern was found in the beam profile, which was caused by the mirror structure of the CN-2 guide. By using a scanning table, very clear radiography image with the cold neutron beam was obtained for a thick iron object.