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Medical and dental x-rays account for about ____% of manmade radiation
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Medical radiation contributes ____% of the public's exposure
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RADT465 Rad Protect
ARRT registry review covering radiation protection content area
| Question | Answer |
|---|---|
| Medical and dental x-rays account for about ____% of manmade radiation | 79% |
| Medical radiation contributes ____% of the public's exposure | 50% |
| A high-speed electron is deflected from its path and the loss of kinetic energy is emitted in the form of an x-ray photon | Bremsstrahlung |
| A high-speed electron ejects a tungsten K-shell electron, leaving a K-shell vacancy, an electron from a higher-energy level shell fills the vacancy | characteristic |
| An incoming photon releases all its energy as it ejects an inner shell electron, an electron from a higher-energy level shell fills the vacancy | photoelectric effect |
| A fairly high-energy x-ray photon interacts with tissue atoms, giving up some of its energy to eject an outer shell electron | Compton scatter |
| This type of radiation comprises 70% - 90% of the primary x-ray beam | Bremsstrahlung |
| The photoelectric effect is more likely to occur in absorbers having | high atomic number with low energy photons |
| Contributes significantly to patient dose | photoelectric effect |
| Contributes to image fog and significant dose to imaging personnel | Compton scatter |
| ________ effects occur randomly and are all or nothing type effects (cancer, genetic effects, late effects) | stochastic |
| ________ effects are predictable (skin erythema) and have no safe dose below which no effect is observed | nonstochastic |
| Stochastic effects have which dose-response curve | linear nonthreshold |
| nonstochastic effects have which dose-response curve | nonlinear threshold |
| As the linear energy transfer of radiation increases, the radiation's ability to produce biologic damage | increases |
| The most radioresistant type of cell | nerve cells |
| The greatest effect of irradiation will be observed if | a large quantity of radiation is delivered in a short time to the whole body |
| ___________ grid ratios are often used in mobile imaging because they offer more positioning latitude | 5:1 & 6:1 |
| General radiographic fixed equipment generally has a ____________ grid | 10:1 or 12:1 |
| The consistency in exposure output during repeated exposures at a particular setting | reproducibility |
| If 100 and 200 mA are used and the exposure time is kept constant, the 200 mA station should produce twice the exposure rate of the 100 mA station. This is an example of | linearity |
| Annual occupational dose-equivalent limit is __ rem/yr | 5 |
| The gestational dose limit to the fetus must not exceed | 0.5 rem |
| All fluoroscopic equipment must provide at least __ inch between the source and the patient | 12 |
| A student under the age of 18 years must not receive an annual dose of more than | 0.1 rem |
| The monthly fetal dose must not exceed | 0.05 rem |
Created by:
rgrieger
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