ARRT Exam Practice Questions With Complete Solutions.

ARRT Exam Practice Questions With Complete Solutions. Units of radiation absorbed in the air? - CORRECT ANSWER-Gya The change in the x-ray beam as it travels through a patient? - CORRECT ANSWERattenuation photon tissue interaction that makes radiology possible because of it's creation of contrast? - CORRECT ANSWER-photoelectric interaction (fully absorbed = contrast) Unit of radioactivity? - CORRECT ANSWER-becquerel unit of effective dose? - CORRECT ANSWER-Sievert Linear energy transfer ... - CORRECT ANSWER-varies for different types of radiation unit of Bq would be used in what imaging modality? - CORRECT ANSWER-Nuclear medicine graphs that show relationship between radiation received and the organisms response? - CORRECT ANSWER-dose-response relationship Medical x-rays are examples of? - CORRECT ANSWER-artificially produced radiation Cataractogensis does not occur at low levels of radiation exposure; it is best expressed by? - CORRECT ANSWER-threshold dose-response relationship Increased dose equals increased probability of effects best describes which of the following? - CORRECT ANSWER-Stochastic effects (probability) The cumulative occupational exposure for a 22 year old radiographer is? - CORRECT ANSWER-220 mSv (agex10=_____mSv) The annual effective dose limit for the general public, assuming frequent exposure is? - CORRECT ANSWER-1.0 mSv FREQUENT EXPOSURE Secondary protective barrier must be at least how thick? - CORRECT ANSWERSecondary = 1/32 Pb equivalent Primary= 1/16 Pb equivalent The intensity of the scattered beam is 1/1000 the intensity of the primary beam at a _______ angle 1 meter from the patient? - CORRECT ANSWER-90 degree angle The minimum source to skin distance for a fixed fluoro is? - CORRECT ANSWER-15 inches (fixed) 12 inches (mobile) Use of FEMALE gonadal shielding reduced dose by what percent? - CORRECT ANSWER-50% 95% for Males Cells that are oxygenated are more susceptible to radiation damages describes: - CORRECT ANSWER-Oxygen enhancement ratio Blood count depressed after a whole body dose equvilant of at least how many rads - CORRECT ANSWER-.25 Sv Highly reactive ions with unpaired electrons in their outer shell are called? - CORRECT ANSWER-Free radicals the master molecule that directs cell activities is? - CORRECT ANSWER-DNA Process of SOMATIC cell division is? - CORRECT ANSWER-Mitosis The most common effect from exposure to ionizing radiation is? - CORRECT ANSWERNothing -- most common effect Most radiation induced damage to cells occurs? - CORRECT ANSWER-From background radiation Radiation doses up to _______ are considered relatively low risk to the embryo and fetus. - CORRECT ANSWER-.20 mSv Cell that is relatively insensitive to radiation is? - CORRECT ANSWER-Nerve cells Are caused by a large dose of HIGH-LET radiation to a large area of the body. - CORRECT ANSWER-Somatic effects of radiation