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What is the monthly gestational dose equivalent limit for the fetus of a pregnant radiographer?
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What are some sources of natural background radiation that contribute to whole-body dose?
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RADT 465 Rad. Prot.
ARRT Registry Review Covering Radiation Protection Content Area
| Question | Answer |
|---|---|
| What is the monthly gestational dose equivalent limit for the fetus of a pregnant radiographer? | 0.5 mSv (Saia, p135) |
| What are some sources of natural background radiation that contribute to whole-body dose? | Terrestrial radionuclides & internal radionuclides (Saia, p136) |
| Which x-ray interaction with matter is responsible for the most occupational exposure? | Compton scatter (Saia, p137) |
| What factors stimulate the occurrence of the photoelectric effect? | Absorbers having a high Z numbers & positive contrast media (Saia, p138) |
| What type of detector is a component of an optically stimulated luminescence? | Aluminum oxide (Saia, p139) |
| How is the definition of linear energy transfer (LET) best described? | A method of expressing radiation quality & a measure of the rate at which radiation energy is transferred to soft tissue (Saia, p140) |
| Late effects of radiation are also referred to as what? | Stochastic (Saia, p141) |
| Primary radiation must be at least ___ high and have ___ thickness of lead shielding. | 7 ft & 1/16-in (Saia, p139 & 142) |
| Which acute radiation syndrome requires large exposures before radiation effects become visible or noticeable? | Central nervous system (CNS) (Saia, p143) |
| What unit of measurement is used to describe occupational exposure? | rem (Sv) (Saia, p144) |
| Isotopes are defined as atoms that have what? | The same atomic number but a different mass number (Saia, p145) |
| What section of the GI tract is the most radiosensitive? | Small bowel (Saia, p146) |
| Filters in a film badge function to do what? | To measure radiation quality (Saia, p147) |
| Name some examples of late effects of ionizing radiation. | Leukemia, local tissue damage, & malignant disease (Saia, p148) |
| Which x-ray interaction is responsible for the most dose to the patient? | The photoelectric effect (Saia, p149) |
| If a dose of 50 mR per hour is produced with a distance of 3 feet from the source, what would the dose be after 20 minutes at a distance of 5 feet? | 6 mR (Saia, p 150) |
| Examples of secondary radiation barriers include what? | The control booth, lead aprons, & the X-ray tube housing (Saia, p 151) |
| How do intensifying screens constructed of rare earth materials help in lowering the dose to the patient? | They permit the use of lower mAs (Saia, p152) |
| What type of dose-response curve represents genetic and some somatic effects? | Linear, nonthreshold (Saia, p153) |
| What is the maximum permissible tabletop exposure rate during fluoroscopy? | 10 R/min (Saia, p154) |
| ___ radiation passes through the tube housing apart from the path and direction of the useful beam. | Leakage (Saia, p155) |
| Some examples of electromagnetic radiation include what? | X-rays, gamma, visible light, radio waves (Saia, p156) |
| How are lead aprons correctly checked for cracks? | By fluoroscoping them once a year (Saia, p157) |
| What are some examples of sources of radon exposure? | Indoors, in houses & smoking cigarettes (Saia, p158) |
| How are LET and RBE related? | Directly; if one increases, the other increases (Saia, p158) |
Created by:
meschnell
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