NEUTRON RADIOGRAPHY WITH OPTIMIZED BEAM FORMATION AND FILTERING UNIT

Abstract A special unit to optimize the neutron beam diameter and to use various filters has been constructed and tested at the Budapest dynamic neutron radiography station. It consists of two symmetrically placed cylindrical Pb diaphragms plated with Cd. From both diaphragms half cones were worked out and by rotating them the beam diameter can be changed continuously. The unit is equipped with Cd and In filters, which can be moved into the neutron beam. The whole unit is fixed on a carriage and movable by remote control.