Patent ID: 6664539
Filing Date: 2003-12-16
Classification: G21C,Y02E

Abstract:
A method of investigating the response of an instrument to gamma emissions using a source package, the method comprising:providing a source package on one side of a collimator including an aperture and a detector on the other side of the collimator relative to the source package, the collimator and detector positions defining an operating axis for the instrument; moving the position of the source package relative to the collimator, with the response of the detector being measured for two or more of those different positions of the source package; an aperture in the collimator having a first dimension measured in a first direction perpendicular to the operating axis; the source package comprises one or more individual gamma emitting sources provided in a container, in use the individual source(s) having an overall extent in the first direction, the overall extent, during at least 10 seconds of use, being two or more times the first dimension of the collimator in that first direction.