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RADT 456

ARRT Registry Review Covering Radiation Protection

QuestionAnswer
As the energy of the beam increases, what happens to wavelength and frequency? Wavelength decreases and frequency increases. Pg. 225.
Is the energy of the beam homogenous or heterogenous? Heterogeneous (polyenergetic). Pg. 227.
In the primary beam, is there more bremsstrahlung or characteristic radiation? Brems radiation comprises 70-90% of the x-ray beam. Pg. 227.
In characteristic radiation, what shell is left vacant? K shells are left vacant until an e- from a higher energy level moves into it. Pg. 228.
What type of interaction between x-ray photons and matter contributes to patient dose? Photoelectric effect. Pg. 228.
What type of interaction between x-ray photons and matter contributes to occupational dose? Compton scatter. Pg. 228.
How fast do x-rays travel? All electromagnetic radiation travels at 186,000 miles/s. Pg. 229.
Are LET and RBE directly/indirectly related? They are directly related. Pg. 233.
Are diagnostic x-rays considered high or low LET? Low LET. Pg. 233.
If a woman is possibly pregnant, when is the safest time to schedule x-rays? The first 10 days following the onset of menses. Pg. 237.
What is the most radiosensitive cell? Lymphocyte. Pg. 240.
What is the overall most efficient beam-restricing device? Collimator. Pg. 248.
Inherent filtration accounts for how many mm Al equivalent? 0.5 mm Al. Pg. 251.
Equipment operating between 50 and 70 kv must have how much Al equivalent? 1.5 mm Al equivalent. Pg. 252.
When should a technologist use gonadal shielding? When the gonads are within 5 cm of a collimated field. Pg. 253.
As film speed increases, what happens to the patient dose? As film speed increases, patient dose decreases. Pg. 258.
What is reproducibility? Consistency in exposure output during repeated exposures at a particular setting. Pg. 259.
The SSD must be how many inches away for mobile fluoroscopic equipment? 12 inches. Pg. 261.
What is the principle function of x-ray beam filtration? Reduce patient skin dose. Pg. 263.
What is the approximate intensity of scattered radiation from the patient? 1m from the patient is 0.1% of the primary beam. Pg. 268.
Leakage radiation from the x-ray tube must not exceed what? 100 mR/h at 1m from the tube. Pg. 268.
Protective lead aprons must be at least what Pb equivalent? 0.25mm Pb equivalent. Pg. 269.
1Gy equals how many rads? 100rads. Pg. 279.
1Sv equals how many rem's? 100rems. Pg. 279.
What is the occupational dose limit for exposed individuals per year? 5rem or 50mSv/y/ Pg. 286.
Created by: burton08L