Radiography MCQ| 56 QUESTIONS| WITH COMPLETE SOLUTIONS

"The reduction in radiation exposure decreases exponentially as you move farther away from the radiation source". This statement explains which of the following? a) The edge gradient b) The heel effect c) The photoelectric effect d) The inverse square law correct answer: d Electrons travel a) toward the cathode in an x-ray tube b) away from the anode in an x-ray tube c) toward the anode in an x-ray tube d) within the nucleus of an atom correct answer: c If an exposure guide indicates an exposure of 15mAs and your x-ray machine output is 25mA, your exposure time will be: a) 0.5 seconds. b) 0.8 seconds. c) 1.8 seconds. d) 0.6 seconds. correct answer: d Distortion is kept to a minimum when: a) The body part of the patient being radiographed is tilted b) The object is placed near the centre of the x-ray beam c) The thicker part of the patient is placed at the anode end of the tube d) The object-film distance (OFD) is large correct answer: b When thinking about the damage to humans caused by ionising radiation, what is meant by 'somatic effects'? a) Directly harmful to the person exposed b) The sensitivity of specific tissue types to radiation c) Harmful to future generations d) Degenerative effects, which when severe become clinically significant correct answer: a The magnitude of the hazardous effect of x-rays is dependent on tissue type. Which of these tissue types is most able to withstand radiation? a) Bone marrow b) Skin c) Muscle d) Lens of the eye correct answer: c A