Chapter 9 Radiation Health
FIGURE 9-3 Here you see a long round BID being used. Answer the following questions:
2. The long, 16-inch, round BID is said to expose the patient to less radiation than the short, 8-inch BID. Both BIDs have a diameter of 2.75 inches at the open end. If the short BID requires exposure times 4 times shorter than the long BID (this is true), how can the long BID result in less patient exposure? Explain.