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Ch3. Interactions
RAD Protection/Biology. Chap 3. Interactions with matter
| Question | Answer |
|---|---|
| The amount of energy absorbed per unit mass is referred to as the | absorbed dose (D) |
| For a typical x-ray unit, the energy of the average photon in the beam is about _______ the energy of the most energetic photon. | 1/3 |
| A 100 kVp beam has an average energy of what? | 33 keV |
| Reduction of number of photons in the beam through absorption and scatter is termed | attenuation |
| Some photons traverse the patient without interacting, this is called | direct transmission. |
| Photons that undergo scatter interactions may still traverse the patient and strike the IR, this process is called | indirect transmission |
| 2 most common methods to limit the effects of indirect transmitted photons? | air gap technique and grids |
| Before the photons produced by the source enter human tissue they are referred to as | primary photons |
| coherent scatter, the photon usually does not loose kinetic energy when it interacts with an atom of human tissue, it just redirects by _____ degrees or less. | 20 |
| Coherent scatter is most common under what energy | 10 keV |
| The ejected orbital e-, called a _________, possesses kinetic energy ______ to the energy of the incident photon. | photoelectron, equal. ((photoelectric absorption)) |
| Photoelectric absorption: Atom ejects photoelectron creating an inner shell vacancy, an e- from outer shell drops to fill the space by releasing energy in the form of a __________ | characteristic photon. |
| A characteristic photon has energy that is directly related to | the shell structure of the atom from which it was emitted. |
| probability of PE absorption depends on what things? (4) | energy of the incident photon, atomic #, mass density, body part thickness (approx. linear... 2 structures of same density and Z# but one is 2x as thick, thicker structure will absorb 2x as many) |
| Incoherent, inelastic, modified scattering are all AKA | Compton scattering |
| An incident x-ray that surrenders some energy but continues in a different/new direction is called | Compton scattered photon |
| Pair production needs energy of at least ____. | 1.022 MeV |
| Photodisintigration occurs at more than _____ in high energy radiation therapy treatments. | 10 MeV |
| Which interaction collides with the nucleus, which directly absorbs all the photons energy? | photodisintigration |
| E=mc^2 | increased relativistic mass (m) of a body comes from the energy of motion of the body-that is, its kinetic energy (E)-divided by the speed of light squared (c2). |
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Zoest35
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