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Radiation Protection

QuestionAnswer
single, most important factor in helping patient dose to a minimum? beam restriction/ collimation pg. 254, D.A. SAIA
what are the three basic types of beam restrictors? aperture diaphragms, cones, collimators pg. 254 D.A SAIA
Controls quantity of x-rays with no effect on quality of x-rays mAs pg. 257, D.A SAIA
Controls quality of x-rays and also affects quantity of x-rays kV pg. 257, D.A. SAIA
in effort to keep radiation dose to a minimum you use the lowest____ and highest____ that produces desired radiographic results lowest mAs and highest kV pg. 257, D.A SAIA
NCRP guidline for equipment operating above 70kV for filtration requirement? minimum, total plus added filtration, of 2.5mm Al equivalent. pg. 258 D.A SAIA
At what range of collimated field should gonadal shielding be used? within 5 cm of the collimated field pg. 259, D.A. SAIA
How many types of AEC's currently exist? Two, ionization chamber type and a phototimer type pg. 264, D.A. SAIA
AEC type located between the patient and the IR? ionization chamber pg. 264, D.A SAIA
AEC type located beneath or behind the IR? phototimer pg. 264, D.A SAIA
When are grids appropriate to use? for anatomy that measures more than 10cm pg. 265, D.A SAIA
What is reproducibility? the ability to consistently reproduce exposure output during repeated exposures at a particular setting. pg. 266. D.A SAIA
What is linearity? when a change in mA is doubled and the exposure time remains constant and the exposure is doubled. pg. 267, D.A SAIA
variation in output intensity must not exceed what for reproducibility? 5% pg. 267, D.A SAIA
for linearity any variation in output intensity must not exceed _____? 10% pg. 267, D.A SAIA
x-ray tube housing must keep leakage radiation to what measurement? less than 100mR/h when measured 1 m from the tube pg. 267, D.A SAIA
PBL/ positive beam limitation device must correspond to what limitations for patient protection? visible light within 4% of the SID pg. 267, D.A SAIA
collimation devices must correspond to what limitations for patient protection? visible light within 2% of SID pg. 267, D.A SAIA
Limit for tabletop intensity of fluoroscopic beam 10 R/min pg. 267, D.A SAIA
x-ray tube housing leakage radiation must not exceed ___ 100mR/h when measured 1 meter from the tube pg. 267, D.A SAIA
tool for testing accuracy of x-ray timer for single-phase equipment? spinning-top test tool pg. 267, D.A SAIA
tool for testing accuracy of x-ray timer for three-phase equipment? synchronous spinning tool or an oscilloscope pg. 267, D.A SAIA
SSD must not be fewer than ____ for all radiographic procedures other than dental radiography. 12 inches pg. 267, D.A SAIA
What must the SSD be for fixed fluoroscopic equipment? 15 inches pg. 267, D.A SAIA
What must the SSD be for mobile fluoroscopic equipment? 12 inches pg. 267, D.A SAIA
What type of switch must exposure switches be? "deadman's" switch pg. 267, D.A SAIA
example of primary radiation barrier? lead walls, doors of radiographic rooms. pg. 277, D.A SAIA
requirements for primary radiation barrier? walls 1/16th inch (1.5mm) lead thickness and 7ft height pg. 277, D.A SAIA
what is secondary radiation? leakage or scattered radiation. pg. 277, D.A SAIA
what is the primary source of secondary radiation? the patient pg. 277, D.A. SAIA
example of secondary radiation barrier? control booth, walls above 7ft in height, pg. 277, D.A SAIA
required depth of lead for secondary barriers? 1/32 inch lead pg. 277, D.A SAIA
the three cardinal rules of radiation safety? time, distance, shielding pg.276, D.A SAIA
what is the minimum Pb equivalent requirement for lead aprons? 0.25mm Pb equivalent pg.278, D.A SAIA
Created by: saluke