A R/F Room stands for radiography/fluoroscopy. It is the grandfather of human imaging studies. The changes to this modality over time have been minimal and brings value to imaging departments and centers.
Besides acquiring static images on the X-ray (radiographic) side, the X-ray beam that is passed through the body is used with a video screen. The most common studies performed using Fluoroscopy involves using X-rays to take "live" images of the body. It is typically used to examine the parts of gastrointestinal tract such as the esophagus, stomach, small intestine and colon, Catheter insertion and manipulation (to direct the movement of a catheter through blood vessels, bile ducts or the urinary system). It is also used for placement of devices within the body, such as stents (to open narrowed or blocked blood vessels), angiograms (to visualize blood vessels and organs) and Orthopedic surgery (to guide joint replacements and treatment of fractures).
Each state has different laws when it comes to lead lining your R/F room. Some times the types of procedures you will be performing will determine if you need a lining. If you angle the image intensifier emitting the beams on a wall instead of downward you may need a lead lining. Below are links for most states. Not all the states require shielding and some states do not provide specific information about shielding on their website.