Scanning mechanism for radiation TV set

In a radiation monitoring system comprising a scanning mechanism for remote-scanning an observation object which is a radiation source by the use of a directional radiation detector, a scanning control section for controlling the operation of the scanning mechanism, and a radiation TV set for imaging scanning results, said radiation scanning mechanism comprising:

• an inner frame which is provided with the directional radiation detector, and is rotatable around a rotary shaft perpendicularly intersecting a central axis of the detector and passing through a center of the detector;
• an outer frame which rotatably supports the rotary shaft of the inner frame and is rotatable around a shaft perpendicular to the rotary shaft of the inner frame;
• an outer frame support base for rotatably supporting a rotary shaft of the outer frame, said outer frame support base being secured to a support rod and the rotary shaft of the outer frame being perpendicular to the support rod;
• an outer frame driving section which is secured to the outer frame support base, connected with the rotary shaft of the outer frame, and rotates the outer frame by a control output given from the scanning control section;
• and
• an inner frame driving section which is secured to the outer frame, connected with the rotary shaft of the inner frame, and rotates the inner frame by a control output given from the scanning control section.