ARRT Mosby Challenge Test 1 Questions with Complete Solutions, A+

1. Attenuation: - Describes changes in the x ray beam as it travels through the patient Which photon-tissue interaction makes radiography possible because of its creation of contrast? - Photoelectric Which photon-tissue interaction produces that may expose others in the room during fluoroscopy? - Compton The unit of radiation absorbed in air is the - Gya The unit of radioactivity is the: - Becquerel The unit of effective dose is the: - Sievert Linear energy transfer: - Varies for different types of radiation The unit of Bq would be used in what imaging modality? - Nuclear medicine Graphs that show the relationship between radiation received and the organism's response are called: - Dose-response curves Medical x-rays are an example of: - Artificially produced radiation tion Cataractogenesis does not occur at low levels of radia- exposure; it is best expressed by which of the fol- lowing dose-response relationships? - Threshold Increased dose equals increased probability of effects best describes which of the following? - Stochastic effects for a 22-year- The cumulative occupational exposure old radiographer is: - 220 mSv The annual effective dose limit for the general public, assuming frequent exposure, is: - 1.0 mSv The secondary protective barrier used in room shield- ing must be at least how thick? - 2-inch Pb equivalent The intensity of the scattered beam is 1/1000 the intensity of the primary beam at a _____________ angle 1 m from the patient. - 90-degree If the air kerma measured 6 feet from the x-ray table is nO5 Graya, what is the air kerma measured at a distance of 3 feet? - 20 Graya