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RADT 456

ARRT Registry Review Covering Radiation Protection

QuestionAnswer
What are two types of x-ray production? bremsstrahlung and characteristic
What are to two major types of x-ray interactions that occur in the diagnostic range pholtelectric effect: contributes to patient dose. Compton scatter: contributes to image fog .
Describe linear and nonlinear curves. linear: responses that are proportional to the radiation dose recieve. nonlinear: not proportional to the dose recieved
What is the difference between early and late effects early: appear a short time after exposure, high dose in short period of time, not seen in diagnostic radiology, late can appear years after exposure.
State the Law of Bergonie and Tribondeau The following are particularly radiosensitive: stem cells, young immature cells, and highly mitotic cells.
Describe LET. radiation deposits energy as it passes through tissue.
What are somatic effects. effects of radiation that affect the irradiated body itelf.
What is the purpose of beam restriction reduce patient dose, reduces production of scattered radiation, and improves image quality.
What are the functions of mAs and kV. mAs controls quantity, no effect on quality kV controls quality, affects quantity.
When should gonadal shielding be used when gonads lie in, or within 5 cm of, the collimated field, the patient has reasonable reproductive potential; diagnostic objectives permit.
What are the cardinal principles. Time, distance and shielding.
Occupational radiation sources come from what scattered radiation, and leakage radiation.
What are primary barriers, what are secondary barriers primary barriers protect against direct exposure for useful beam. secondary only protect against leakage and scattered radiation.
How many inches must fluoroscopic equipment provide. at least 12 inches but preferably 15.
What does roentgen measure measures ionization in air, measures x or gamma radiation only, is valid up to 3 MeV.
Biologic damage is dependant on what aype of ionizting radiation, atomic number of the tissue, mass density of the tissue, energy of the radiation,
What are 4 types of personal radiation monitors opticlally stimulated luminescence, thermoluminescent dosimeter, film badge, pocket dosimeter
What is the occupationally exposed doselimits for individuals 18 years of age and older 5 rem or 50 mSv
What is occupationlly exposed dose limits for individuals under 18 years of age .1 rem
Where is a fetal monitor worn under the lead abron at waist level
What is the gestational dose limit must not exceed 500 mrem.
Where is most occupational exposure recieved in fluoroscopy and mobile radiography
What is the inverse square law Increasing the distance from the source of radiation reslults in a reduction of occupational exposure
Lead aprons must be at least how thick at least .25 mm Pb equivalent
Why does fluoroscopy deliver a higher patient dose because of decreased SSD
Created by: bnpickrell