CAMRT Safety Code 35 Questions and Answers 100% Verified

CAMRT Safety Code 35 Questions and Answers 100% Verified what kind of radiation protection model is used? linear non-threshold model for mobile radiography, how far from the source must the operator be if they're not wearing any protective wear? 3 metres Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:08 / 0:15 Full screen What is the dark current? X-ray emission even though the irradiation switch is not activated, caused by residual charge left in the capacitor discharge unit are lead shields mounted on the x-ray machine a good enough substitute for protective clothing like lead aprons? NO to avoid scatter from the patient, where should the tube be? (When vertical) under the patient if the tube is horizontal, where should the tech stand? on the side of the image receptor x-rays account for what percentage of man-made radiation dose to the general population? 90% what is the LMP window? 10 days after the last onset of menstruation if a pregnant patient must be x-rayed, what position should they go in? prone magnification mode may _______ the dose to the patient increase What does DRL stand for? diagnostic reference level what is the annual limit of dose for other people outside of an x-ray room (passerbys) 1 mSv per year the radiation levels in controlled areas that are occupied routinely by radiation workers must be such that no radiation worker is occupationally exposed to more than _____ mSv per year 20 mSv In uncontrolled areas, where radiation sensitive populations are present, such as paediatric wards, a constraint level of _____ mSv per year should be used. 0.30 The control booth, and the viewing window, must have shielding properties such that no operator is occupationally exposed to more than ____ mSv/week 0.4 Radiation should scatter at least __________ before reaching the opening of the control booth. A once B twice C five times D ten times E ninety degrees B: Twice what is a measure of the operational time or the amount of use of the X-ray equipment? Workload what is the fraction of time that the area under consideration is occupied by the individual (employee or public) who spends the most time at that location while the X-ray equipment is operating? Occupancy Factor what is the fraction of the workload during which the X-ray beam is pointed in the direction under consideration? Use factor ______________ protective barriers are required to provide shielding from scattered and leakage X-rays secondary all x-ray equipment must follow the requirements of which 2 acts? radiation emitting devices act and the Food and Drugs Act and their promoted regulations the shielding of the x-ray tube housing should make it so leakage radiation does not exceed an air kerma rate of _____ mGy/h at a distance of _________ from the focal spot 1 mGy/h, 1 meter for an x-ray tube voltage of 70 kVp, what is the required half value layer? 2.5 mm of Al what is Radiation Output Reproducibility? any combination of loading factors should be able to "reproduce" it's output, and should not vary too much what shouldn't the coefficient of variation exceed for Radiation Output Reproducibility? (10 consecutive measurements, taken in 1 hour, with the same SID) A. 0.5 B. 0.06 C. 0.25 D. 0.05 0.05 (5%) What is Radiation Output Linearity? What is the SC35 limit for it? when kVp is constant, the air kerma (mGya) divided by the mAs at 2 mA stations should not differ by more than 10 times their sum. What is the Radiation Output Linearity formula? (X1-X2) 0.10 (X1+X2) how much should the variation in mean linearized data for AEC not exceed? (for constant tube voltage and thickness of part) 20%. when the voltage is 50 kv or more, what's the current-time product limit? (mAs limit)? 600 mAs per irradiation Accuracy of Loading Factors! What are they for: - tube voltage - tube current - loading time - current-time product (mAs) voltage: 10% current: 20% loading time: 10% + 1ms current-time product: 10% + 0.2 mAs What is Minimum Irradiation Time Capability? The minimum amount of time an AEC system must be able to irradiate for. The AEC timer must have a minimum irradiation time capability of 1/60 s or the time required to deliver a current-time product of 5 mAs, whichever is greater. The AEC timer must have a minimum irradiation time capability of ______ of a second or the time required to deliver ____ mAs, whichever is greater. 1/60, 5 mAs Beam Limiting Devices: The minimum X-ray field size permitted by the beam limiting device shall not exceed ___ cm by ___ cm at a focal spot to image receptor distance of ____ cm. 5cm X 5cm, 100 cm When the X-ray beam axis is perpendicular to the image receptor plane, the separation between the perimeter of the visually defined field and that of the X-ray field does not exceed ______% of the focal spot to image receptor distance. 2% What are the accuracy of loading factors limits for radioscopy (fluoroscopy)? tube voltage: 10% tube current: 20% FS to skin distance should not go below ___ cm for mobile and ___ cm for stationary equipment 30 cm for mobile and 38 for stationary what needs to happen when activating high-level irradiation control in fluoro? audible noise needs to be heard