Patent Number: 
Section: claims

1. A radiation image taking apparatus, comprising:a radiation detecting unit that converts a radiation into an electrical signal;a case that contains the radiation detecting unit; anda grid unit which includes a grid that removes a scattered radiation and a frame,wherein at least one of the sides of the frame is a U-shape for being attached to the case. 2. An apparatus according to claim 1, wherein the frame is engaged with opposite sides of the case. 3. An apparatus according to claim 1, wherein the frame of the grid unit is made of metal. 4. A radiation image taking apparatus, comprising:a radiation detecting unit that converts a radiation into an electrical signal;a case that contains the radiation detecting unit; anda photo timer unit which includes a photo timer that measures a dose of the radiation and a frame,wherein at least one of the sides of the frame is a U-shape for being attached to the case. 5. An apparatus according to claim 4, wherein the frame is engaged with opposite sides of the case. 6. An apparatus according to claim 5, wherein the case comprises detection means for detecting whether or not the frame is attached. 7. An apparatus according to claim 6, wherein the detection means is adapted to recognize identification information of the frame.