Question:
When X-rays interact with matter, in which of the following situations, the chances of Compton's effect are more?
When X-rays interact with matter, in which of the following situations, the chances of Compton's effect are more?
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- Photoelectric Effect: Low energy, inner-shell electrons. Results in complete photon absorption, providing diagnostic contrast on the film.
- Compton Effect: High energy, outer-shell electrons. Results in scatter radiation, which degrades image quality and increases occupational exposure.
- Compton Effect: High energy, outer-shell electrons. Results in scatter radiation, which degrades image quality and increases occupational exposure.
Updated On: Jul 23, 2026
- Low energy X-ray photon interacting with inner shell electrons of the atom of the matter
- Low energy X-ray photon interacting with outer shell electrons of the atom of the matter
- High energy X-ray photon interacting with inner shell electrons of the atom of the matter
- High energy X-ray photon interacting with outer shell electrons of the atom of the matter
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
When an X-ray beam passes through matter (such as animal tissue), the photons interact with the atoms via different physical mechanisms depending on the photon energy and the atomic number of the target material.
The two primary interactions of importance in diagnostic radiography are the Photoelectric Effect and Compton Scattering.
Step 2: Detailed Explanation:
Let us analyze the conditions under which these physical interactions occur:
1. Photoelectric Effect:
This interaction typically occurs at lower photon energies (low-energy X-rays).
A low-energy photon interacts with a tightly bound inner-shell electron (K or L shell) of a target atom.
The photon transfers its entire energy to the electron, ejecting it as a photoelectron, while the original photon is completely absorbed.
This is represented by the conditions in Option A.
2. Compton Effect (Compton Scattering):
This interaction becomes dominant at higher diagnostic photon energies (high-energy X-rays).
A high-energy X-ray photon interacts with a loosely bound, outer-shell electron of a target atom.
The photon transfers only a portion of its energy to eject the outer-shell electron (Compton electron), and the remaining energy is redirected as a lower-energy scattered photon in a different direction.
Because the binding energy of outer-shell electrons is very low compared to the energy of the incoming photon, they are treated as "free" electrons.
Thus, the probability of the Compton effect is highest when high-energy photons interact with outer-shell electrons.
Step 3: Final Answer:
The chances of the Compton effect are highest when high-energy X-ray photons interact with outer-shell electrons of the atom.
When an X-ray beam passes through matter (such as animal tissue), the photons interact with the atoms via different physical mechanisms depending on the photon energy and the atomic number of the target material.
The two primary interactions of importance in diagnostic radiography are the Photoelectric Effect and Compton Scattering.
Step 2: Detailed Explanation:
Let us analyze the conditions under which these physical interactions occur:
1. Photoelectric Effect:
This interaction typically occurs at lower photon energies (low-energy X-rays).
A low-energy photon interacts with a tightly bound inner-shell electron (K or L shell) of a target atom.
The photon transfers its entire energy to the electron, ejecting it as a photoelectron, while the original photon is completely absorbed.
This is represented by the conditions in Option A.
2. Compton Effect (Compton Scattering):
This interaction becomes dominant at higher diagnostic photon energies (high-energy X-rays).
A high-energy X-ray photon interacts with a loosely bound, outer-shell electron of a target atom.
The photon transfers only a portion of its energy to eject the outer-shell electron (Compton electron), and the remaining energy is redirected as a lower-energy scattered photon in a different direction.
Because the binding energy of outer-shell electrons is very low compared to the energy of the incoming photon, they are treated as "free" electrons.
Thus, the probability of the Compton effect is highest when high-energy photons interact with outer-shell electrons.
Step 3: Final Answer:
The chances of the Compton effect are highest when high-energy X-ray photons interact with outer-shell electrons of the atom.
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