Terms in this set (33)
-Requires an extremely high energy incident photon (over 10 mev)
-The incident photon collides with the nucleus of the irradiated object and is absorbed
-The nucleus then emits/ejects a neutron or alpha particle in response.
-Has an extremely high energy incident photon (1.02 mev)
-The incident photon interacts with the nucleus of irradiated object
-Nucleus then emits 2 particles with equal mass and energy but opposite in charge (positron and negatron)
-Annihilation then takes place and 2 photons are then emitted
A positron is highly reactive and volatile and will undergo a large interaction with a nearby electron.
The probability of Compton ______________ when thickness of tissue increases.
The probability of Compton ______________ when mass density of tissue increases.
Is not affected
The probability of Compton ______________ when Atomic number of tissue increases.
The probability of Compton ______________ when energy of x-ray photon increases.
3 outcomes when x-rays interact with human tissue
1. Pass through without interaction (direct transmission)
2. completely absorbed by the tissue (development of latent image)
3. Interact with tissue and are deflected (causing scatter and pt./occupational dose)
Interactions common to ionizing radiation
1. Coherent scatter
2. PE absorption
3. Compton scatter
4. Pair production
-Other names: Classical, elastic, and unmodifying
-DOES NOT cause biologic damage (but is considered a form of scatter)
-Emits a photon with the same energy level as the initial photon
-Gives minimal contribution to film fog
Very low (<10 kev)
What is the energy level of a coherent scatter photon?
Non ionizing (meaning no patient dose)
Is coherent scatter ionizing or non-ionizing?
Same energy as initial photon
photon passing through without an interaction
k-shell (or L)
What is the electron energy level affected in a PE interaction?
Ionizing (contributes to Pt. dose)
Is PE ionizing or non-ionizing?
What is the energy level of the photon in a PE interaction?
-Responsible for the latent image
-The incoming x-ray photon hits the inner k (or L) shell of the atom into the tissue
-The incident photon must by slightly higher energy than the binding energy of the k-shell electron in order for the k-shell electron to be ejected
-Te electron vacancy is then filled by a cascading process (outer shell electrons to inner shell vacancies)
-Occurs most often in atoms with high z#'s/ atomic numbers
Patient dose and It does not contribute to radiographic image
Consequences of PE interaction include: (Hint 2)
(happens in PE) When an ejected electron or a secondary x-ray photon is created during PE interaction that can knock out an electron inside the same atom.
Secondary radiation in the form of an x-ray photon that emerges. It is generally weak and can contribute to fog. It is absorbed in OID.
The probability of PE _____________ when there;s an increased energy of x-ray photon
The probability of PE _____________ when the atomic number of tissue increases
The probability of PE _____________ when mass density of tissue increases
The probability of PE _____________ when thickness of tissue increases
Ionizing (contributes to pt. dose)
Is compton scatter ionizing or non-ionizing?
What is the energy level affected during a compton interaction?
-Incident x-ray photon interacts with an outer shell electron of atom in irradiated object
-Electron is ejected as a Compton scattered electron/recoil electron which May have enough energy to ionize other atoms until combining with a needy atom within the tissue within a few micrometers
-Incident photon continues in a new direction with slightly less energy than before and is called a Compton photon
All energy levels!
Compton interactions can occur at what energy level?
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