Radiation Physics Chapters 7 & 12
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21 terms
Terms | Definitions |
|---|---|
 In a characteristic interaction, an x-ray photon results when: | An outer shell electron fills a hole left by an ejected inner shell electron |
| When a ______________________ occurs, the incident electron interacts with the force field of the nucleus: | Bremsstrahlung Interaction |
| The energy of a characteristic photon depends on the: | Difference of binding energies of the two shells involved |
| In a bremsstrahlung interaction, the emission of a photon is caused by: | The deceleration of the electron as it nears the nucleus |
| It is necessary for the incident electron to have higher energy than the K-shell electrons in order for this interaction to occur: | Characteristic |
| The principle difference between an x-ray photon and a gamma ray is the: | Origin of the photon |
| The energy of the photons produced in bremsstrahlung x-ray production is dependent on: | Incident electron speed Atomic # of target Electron to nucleus distance |
| Approximate percentage of electron energy that is converted to x-ray energy in the x-ray tube? | 1% |
| Approximate percentage of Kenetic Energy converted into thermal energy 'heat'? | 99% |
| Explain the difference between keV and kVp | keV: Unit of measure of binding energy of an electron Kvp: controls the quality of electrons striking the target |
| keV | 1,000 electron volts |
| What effect does increasing the mAs have on the total x-ray emission spectrum? | Changes in Amplitude |
| What effect does increasing the kVp have on the total x-ray emission spectrum? | Changes the Amplitude and the Number of Photons |
| X-rays are produced when a high-speed electron from the _____ hits the _____ target. | Cathode / Anode |
| An Incident Electron travels from zero to half the speed of light in: | 2 cm |
| Higher Mass or Speed of the Incident Electron = | Higher quality & quantity of Photons produced. |
| Two types of Target Interactions: | Heat & X-ray production |
| The production of X-ray is very ________. | Inefficient |
| In _______ the majority of energy is converted into radiation instead of heat. | Therapy |
| Two types of target interactions that cause radiation: | Bremsstrahlung / Characteristic |
| Graph of X-ray energies | Spectrum |
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