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Regarding dose and hazards from X-rays: a. The dose from radiation scattered from the patient reduces roughly in proportion to the reduction in the area of the irradiated field b. A 0.25 mm lead apron will attenuate the scatter radiation by a factor of about 100 c. Doubling the area of the X-ray beam approximately doubles the skin dose rate d. The effective dose to the patient can be measured directly using a thermoluminescent dosimeter (TLD) e. Someone in the primary beam at 2 m from the X-ray set could receive the effective dose limit in a few seconds |
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Answer» a. True. b. False. A 0.25 mm apron transmits 5% of the scatter radiation. c. False. The skin dose rate will remain the same. However, the skin dose itself will increase. d. False. e. True. A few seconds is long enough for the primary X-ray beam to reach the dose limit. |
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