Pear shaped collimator for non-destructive control device, has wall with variable thickness defining collimator thickness for emitted radiation based on source and materials to guarantee radiation attenuation except focused radiations

摘要

The collimator (1) has a tubular housing (2) receiving ionizing radiation emitted from a source (S) and a lateral outlet opening (3) communicated with the source for focusing radiations emitted towards a target to be photographed. A wall is placed around the housing. The wall possesses a variable thickness defining a collimator thickness for radiation emitted from the source based on the source and materials e.g. tungsten, constituting the collimator to guarantee attenuation of radiations irrespective of their radiating direction except radiations focused by the opening.