Rule Rule 333-106-0310
Additional Requirements for Radiographic Machines: Source-to-Skin Distance


All mobile or portable radiographic systems shall be provided with means to limit the source-to-skin distance to equal to or greater than 30 cm. This is considered to have been met when the collimator or cone provides the required limits.


Any device provided to limit the SSD must be durable and securely fastened to the system.
Last accessed
Feb. 4, 2021