A mobile radiographic device for use in inspecting pipelines and the like,
comprising an articulating aerial boom coupled to a mobile carriage
vehicle. A pivot mount is rotatably coupled to the distal end of the
aerial boom. A platform having a sliding rail is operatively coupled to
the pivot mount. A mounting fixture is rotatably mounted to a cradle,
which in turn is coupled to the sliding rail of the platform. A radiation
source and a radiation detector are mounted on diametrically opposing
sides of the fixture in order to illuminate the outer surface of a
pipeline or other object with radiation. A first positioning means is
provided for coarsely positioning the scanning apparatus relative to the
pipeline. A second positioning means is provided for finely positioning
the scanning apparatus relative to the pipeline. The second positioning
means is operable from a remote location when the radiation source is
illuminating the pipeline with radiation. The first and second
positioning means provide a plurality of degrees of freedom for
positioning the scanning apparatus.