Abstract
Neutron radiography (NR) technique has been adopted to study the characteristics of some Bangladeshi building materials, e.g. bricks, ceramic bricks, heavy concrete. MS rod and shielding materials (borax mixed and boron carbide mixed shields) and some Slovanian building materials, local names of which are Siporex, Malta, Opeka and Beton. Measurements were made to determine defects in all the samples and water absorption behaviour of the Slovanian building materials. Optical density of the neutron radiographs was adopted for measurements in both the cases.