PURPOSE: To record and accumulate radioisotope distribution images from plural scintillation cameras in the same film or the like, by applying bias to a pair of positional signals from the plural cameras.

CONSTITUTION: When positional signals X1, Y1 and X2, Y2 out of video signals from scintillation cameras 7, 8 are applied to an adapter circuit 10 in a multi- image circuit 9, an offset bias is applied only to the positional signal X2. Consequently, bright point recording positions on an X-ray film or the like due to the positions X1, Y1 is divided from that due to the positions X2, Y2, and radioisotope distribution images obtained by the plural scintillation cameras can be recorded and accumulated in the same film or the like.