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RADT Rad Protection
ARRT Registry Review Radiation Protection
| Question | Answer |
|---|---|
| Tissue Weighting factor | represents the relative tissue radiosensitivity of irradiated materials |
| Type of white blood cell concerned with the immune system that has the greatest radiosensitivity | Lymphocytes |
| Direct effect usually occurs with high or low LET? | high-LET |
| Grids require an increase in kilovoltage or milliampere-seconds? | milliampere-seconds |
| According to the NCRP what is the annual occupational whole-body dose-equivalent limit? | 50 mSv |
| Natural radiation | cosmic radiation and elements within earths crust |
| Human-made radiation | medical radiation, nuclear power plants, and nuclear medicine |
| Radiolysis | irradiation of water molecules and formation of free radicals |
| Late somatic effects | occur years after initial exposure and are caused by low chronic exposures |
| TLDs use? | lithium fluoride |
| Secondary radiation consists of? | leakage and scatter radiation |
| Lead apron | are secondary radiation barriers and must contain at least .25 mm |
| Scattering | occurs when there is partial transfer of the photons energy to matter |
| Absorption | occurs when an x-ray photon interacts with matter and disappears |
| Attenuation | reduction in the intensity of an x-ray beam as it passes through matter |
| Primary radiation barriers | must be 7 feet high and must contain 1.5 mm of lead |
| Rad | radiation absorbed dose |
| low-LET | x-rays and gamma rays |
| alphas | high-LET |
| hypoxic | tissue with little oxygen |
| isobars | atoms with the same mass number but different atomic numbers |
| isotones | have the same number of neutrons but different atomic numbers |
| isomers | have same atomic number and mass number |
| quantity | mAs |
| penetrability | kVp |