Abstract: A mobile support frame for supporting radiation detection equipment used to detect radiation from material passed through the frame including a base structure and at least one support member extending substantially upward from the base with at least one detector mount movably supported along the support member such that the detector mount may be located at a plurality of positions along the support member. A radiation detector probe is operatively mounted on the detector mount. The detector mount is rotatable about an axis perpendicular to the support member such that the radiation detection equipment may be orientated in a plurality of positions about said perpendicular axis to monitor the radioactivity from material passed through the frame.