Chapter 3 - Interactions exposure

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Which type of interaction of x-rays with matter is responsible for the majority of the occupational dose to the technologist?

Compton

Five types of x-ray interactions with matter.

Compton; Photoelectric; Pair Production; Coherent; Photodisintegration

Most of the e- produced at anode.

Bremsstrahlung

Classic, unmodified, Thompson, and Rayleigh scatter.

Coherent

No ionization. No electrons leave or enter atom. small change in direction of photon. essentially no role in diagnostic radiology.

Coherent

Although ______ ______ is nonionizing and insignificant from an image formation standpoint, this interaction does not occur throughout the diagnostic energy range.

Coherent Scattering

Outer shell action. Higher energy photon than photoelectric.

Compton

Photon loses some energy; knocks e- out; then scatters.

Compton

Which of the following has the greatest adverse effect on radiographic contrast?

Compton

Which of the following interactions necessitates the use of the protective lead aprons for personnel during fluoroscopy?

Compton

Which of the x-ray interactions with matter does most of the scattered radiation in the diagnostic range occur?

Compton

The Compton effect is an interaction with an ______ shell electron and the photoelectric effect is an interaction with an ______ shell electron.

Outer/inner

1.022 MeV energy of incoming photon. Nuclear reaction yields positron/negatron pair.

Pair Production

Positron annihilates a nearby e- = two 511 keV photons traveling in opposite directions (180 degrees).

Pair Production

Used in PET imaging

Pair Production

Two x-ray interactions that do not occur in the diagnostic energy range.

Pair Production and Photodisintegration

Which of the interactions is an interaction with the atomic nucleus with the results being a positron and a negatron (electron)?

Pair production

High energy incoming photon goes to nucleus. Nucleus loses a neutron or proton and becomes radioactive.

Photdisitegration

Nuclear reaction most useful in radiation therapy.

Photodisintegration

Electron is ejected as a photoelectron - leaving behind a hole in the inner shell.

Photoelectric

Hole is filled with e- from outer shell - energy is emitted as a characteristic photon.

Photoelectric

In which of the x-ray interactions with matter is the energy of the incident photon completely absorbed by an electron?

Photoelectric

Total absorption of an x-ray.

Photoelectric

Which of the interactions is responsible for radiographic contrast?

Photoelectric

Which of the photon -tissue interactions results in the ejection of a K shell electron?

Photoelectric

Which of the following types of interactions would occur in the diagnostic x-ray range, (50 to 150 kVp)?

Photoelectric; Compton

Inner shell action - incoming photon gives all its energy to inner shell e-. (it is absorbed)

Photoelectron

During the process of coherent scattering, how does the energy of the resulting scattered wave/photon compare to the energy of the incident or original photon?

Stays the same


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