CAMRT PRACTICE TEST QUESTIONS WITH COMPLETE SOLUTION

CAMRT PRACTICE TEST QUESTIONS WITH COMPLETE SOLUTION How far away must the operator stand from the xray tube if not covered with lead? - CORRECT ANSWERS 3 meters 90% of man made radiation to the population is related to? - CORRECT ANSWERS Medical Radiography and Dental For each peak xray voltage, what lead equivalent is required? 100kV or less (o-100) Between 101kV-149kV 150kV or greater (150+) - CORRECT ANSWERS 0-100kV = 0.25mm of lead Greater than 100kV but less then 150kV = 0.35mm of lead 150kV or greater = 0.50mm of lead What protective equipment is required during interventional procedures - CORRECT ANSWERS Full wrap around protective gowns of 0.50mm pb in the front panels and 0.25mm pb in the back panels Thyroid shields with an equivalent of 0.50mm of pb Lead drapes/curtains mounted to II of 0.25mm of pb at 100kv What lead equivalent must protective gloves/ gauntlets possess? - CORRECT ANSWERS 0.25mm of pb What lead equivalent must ceiling mounted lead screens and moveable shields provide? - CORRECT ANSWERS 0.50mm of pb What are the annual radiation dose limits for radiation workers? - CORRECT ANSWERS Whole body= 20mSv Lens of eye= 150mSv Skin = 500mSv Hands = 150mSv All other organs = 500mSv For pregnant women an effective dose of 4 mSv must be applied for the remainder of the pregnancy from all sources What are the annual radiation dose limits to members of the public? - CORRECT ANSWERS Whole body = 1mSv Lens of the eye= 15mSv Skin = 50mSv Hands = 50mSv All other organs = 50mSv *these also apply for students* What are primary protective barriers? Give examples - CORRECT ANSWERS Primary barriers provide shielding from the direct xray beam. Such as, the walls and floor where the tube can be directed -The wall behind the wall bucky -Floor under the table What are secondary barriers and give examples - CORRECT ANSWERS Provide shielding against both leakage and scattered radiation. Walls that the primary beam is not directed towards and the ceiling are secondary barriers. The control booth is also a secondary barrier, the primary beam should never be directed towards it. What should the focal spot to skin distance be for: -Mobile equipment -Stationary equipment -Radioscopic equipment - CORRECT ANSWERS Must not be less than: -Mobile: 30cm -Stationary: 38cm -Radioscopic: 20cm (designed for special procedures that would be impossible at 30cm or 38cm) What are the maximum air kerma rates for radioscopic equipment: -with automatic intensity control -without AIC - CORRECT ANSWERS Not equipped with AIC: 50mGy/min With AIC: 100mGy/min The air kerma rate must not exceed ___ from scattered radiation of radioscopic equipment - CORRECT ANSWERS 2 mGy/h HVL of Aluminum for given tube voltages? (70kV-150kV) - CORRECT ANSWERS 70: 2.5mm 80: 2.9mm 90: 3.2mm 100: 3.6mm 110: 3.9mm 120: 4.3mm 130: 4.7mm 140: 5.0mm 150: 5.4mm How frequently should IP's and cassettes be cleaned and inspected? - CORRECT ANSWERS Cleaned: monthly Visual inspection: Weekly