What is the safe distance of Siemens C-arm machine without shielding?

About 2 meters.

The safe distance of Siemens C-arm machine is determined according to radiation safety standards and equipment operation guidelines. In the absence of shelter, it is generally recommended to keep a safe distance of at least 2 meters. This is to ensure that the operator and people around him can stay away from the radiation area when the equipment is working, thus reducing the potential risk of radiation.

Siemens C-arm machine has the advantages of high image quality, strong real-time imaging ability, strong versatility, flexible operation and controllable radiation dose.