What control option limits exposure to UV/IR?

What control option limits exposure to UV/IR?

• A. Time and distance only
• B. Time, distance, shielding/ short duration of exposure
• C. Shielding only
• D. Short duration of exposure only

Answer: (B)

Limiting exposure to UV and IR is most effective when you use a combination of controls that reduce the energy reaching the body: shorten how long you’re exposed, increase your distance from the source, and place shielding or barriers between you and the source, plus keep exposures brief. Shorter time directly lowers the dose since dose equals irradiance times exposure duration. Increasing distance reduces irradiance, often dramatically due to the inverse-square relationship from many sources. Shielding blocks or attenuates the radiation, providing a physical barrier that lowers what reaches you. Keeping exposure brief is another administrative approach that complements these methods. Using all of these together gives the greatest reduction in exposure, which is why the option that includes time, distance, shielding, and short duration of exposure is the best choice.

Limiting exposure to UV and IR is most effective when you use a combination of controls that reduce the energy reaching the body: shorten how long you’re exposed, increase your distance from the source, and place shielding or barriers between you and the source, plus keep exposures brief. Shorter time directly lowers the dose since dose equals irradiance times exposure duration. Increasing distance reduces irradiance, often dramatically due to the inverse-square relationship from many sources. Shielding blocks or attenuates the radiation, providing a physical barrier that lowers what reaches you. Keeping exposure brief is another administrative approach that complements these methods. Using all of these together gives the greatest reduction in exposure, which is why the option that includes time, distance, shielding, and short duration of exposure is the best choice.