13. Approximately what percentage of the kinetic energy of the electrons is converted to x-rays at the anode? a. Less than 1% b. 25% C. 50% d. 100% A B C D 14. Which form of the x-ray beam is most detrimental to the patient and operator? a. Primary radiation b. Secondary radiation C. Scatter radiation d. Useful beam A B C D

13. **A**<br /><br />Less than 1% of the kinetic energy of the electrons is converted to x-rays at the anode. The vast majority of the energy is converted to heat.<br /><br />14. **C**<br /><br />Scatter radiation is the most detrimental to the patient and operator. While the primary beam is the most intense, it is collimated and directed at the image receptor. Secondary radiation is less intense than the primary beam. Scatter radiation, however, results from the interaction of the primary beam with matter (the patient, table, etc.) and scatters in all directions, posing a greater risk of unintended exposure to the patient and operator if proper shielding is not used.<br />