Patent ID: 8138471

Claim:
An apparatus for inspection in situ of a wellbore casing inside wall and a pipeline inside wall comprising: a radiation source having radiation penetration suitable for imaging a target selected from the group consisting of wellbore casings and pipelines; a rotatable beam collimator adapted to collimate said radiation source and produce a plurality of pencil radiation beams rotatable about said radiation source so as to enable said plurality of pencil radiation beams to sweep azimuthally along an interior surface of a hollow cylinder; a cylindrical radiation detector, segmented into a plurality of segments corresponding to said plurality of pencil radiation beams and rotatable together with said rotatable beam collimator, suitable for detecting radiation scattered off said target and offset laterally from said plurality of pencil radiation beams; and a housing containing said radiation source, said rotatable beam collimator, and said radiation detector and forming a plurality of exit points for exiting of said plurality of pencil radiation beams from said housing.