PURPOSE: To make a self-judgment of moving end in moving by counting gamma rays irradiated in a fixed area of a moving direction within a field of view of a detector and providing a drive control means for stopping the movement of the detector when the counting is prescribed value or less.

CONSTITUTION: At first a detector 10 is aligned at a position A and whole body photograph is started. At the same time a fixed area within a field of view of a detector 10 is set by a setter and signals of gamma rays irradiated in this area are counted. When the detector 10 is moved from the position A to a position C through a position B successively, the image projected in the field of view of the detector 10 is changed in accordance with its photographed parts and counting is changed. In photographing whole body the counting is monitored at a CPU and a detector stand system is sopped when the counting number is prescribed value or less. Therefore, the detector 10 can automatically be stopped without watching stature of a patient and without setting a moving distance of the detector 10.