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With regard to radiation protection of staff: a. The main radiation dose to staff in the room is from leakage radiation from the X-ray tube b. Standing close to the patient avoids scatter within the room and hence reduces the radiation dose c. Wearing lead aprons protects against the primary beam d. Under the Ionising Radiation (Medical Exposure) Regulations 2000 (IRMER), the equivalent dose to the lens of a classified worker should not exceed 150 mSv per annum e. Lead goggles can protect against cataracts |
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Answer» a. False. Leakage radiation from the X-ray tube is than 2% of the dose received by staff in the room. Scatter radiation from Compton interaction within the patient is the main radiation dose to staff. b. False. The principles of radiation protection are: i. Time: the shorter the exposure time, the lower the dose received ii. Distance: the inverse square law states that the intensity of the beam reduces from a source as distance increases iii. The thicker/denser the material, the better the shielding it provides. c. False. d. False. The Ionising Radiation Regulations 1999 (IRR99) are concerned with setting dose limits for worker, not the IRMER. The equivalent dose limit for the lens of a classified worker should not exceed 150 mSv per annum. e. True. Lead goggles are often used by interventionists. |
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