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Ch3. Interactions

RAD Protection/Biology. Chap 3. Interactions with matter

QuestionAnswer
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).
Created by: Zoest35