FIELD: localization of radiation sources. SUBSTANCE: device has chamber with small hole in one of its walls, collimator, devices for closing hole of this chamber, luminescent screen and light-sensitive chamber optically connected with above-mentioned screen. Collimator has two half-collimators which are rotatably movable relative to common axis of rotation; each half-collimator has larger and smaller holes centered by common axis of rotation, bore in form of arc of circle and pin to be received by arc-shaped bore of other half-collimator. Shutters have form of plates located between two flat surfaces. EFFECT: possibility of transition from observation in visible light to gamma radiation. 12 cl, 7 dwg
