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Physics
| Question | Answer |
|---|---|
| What are the 5 ways a photon can interact? | Classical Scattering, Compton Effect, Photoelectric Effect, Pair Production & Photo Disintegration |
| What are other names for Classical Scattering? | Coherent Scattering, Thompson Scattering & unmodified Scattering |
| What is the name of the interaction that occurs when a incident photon strikes an outer shell electron of a target atom (aka atom of the body)? | Classical Scattering |
| What happens to the photon in Classical Scattering? | Photon changes direction slightly but it does not lose energy and the atom is not ionized |
| What energy are the photons in Classical Scattering? | Low energy-10kv or lower |
| How are the photons scattered in Classical Scattering? | in a forward direction, not more than 20 degrees from original |
| How does classical scattering affect the image? | Relatively unimportant bc their energy is too low. |
| What interactions are responsible for Scatter? | Classical & Compton effect |
| What interactions are responsible for Secondary Radiation? | Photoelectric Effect,Pair Production & Photodisintergration |
| What kind of interaction is Classical Scattering? | Photon interaction between a photon and a outer shell electron |
| When talking about a photon interaction what is the meaning of target atom? | Atom of a type of element in the body; part of a tissue |
| What happens to the electron when it is struck by a photon in Classical Scattering? | The electron begins to vibrate |
| At what frequency does the electron vibrate when struck by a photon in Classical Scattering? | Same frequency as the photon |
| What happens when an electron vibrates? | Electromagnetic radiation is produced |
| HOw much energy does the photon that leaves the atom have? | Same energy as the incident photon |
| What happens to the majority of Classical Scattered photons? | They are absorbed before they penetrate through the tissue |
| When using LOW exposure conditions what can Classical Scattering contribute to? | Fog & Loss of detail |
| What is another name for Compton Scattering? | Compton Effect or Modified Scatter |
| What happens in the process of Compton Scattering? | Incident Photon strikes an outer shell electron with enough energy to knock it out of orbit |
| What is the result of Compton Scattering? | Photon loses energy and changes direction while ionizing a target atom |
| At what diagnostic range does Compton Scattering occur? | 25-125 Kev |
| How are the photons scattered in Compton Scattering? | at any angles up to 180 degrees |
| What do you call photons scattered 180 degrees? | Backscatter |
| How much energy does the photon transfer to the electron in Compton Scattering? | at least the amount equal to it's binding energy |
| If an interaction is between an incident electron and an atom what kind of interaction is it? | Production |
| If an interation is between a incident photon and a electron what kind of interaction is it? | Interaction with matter |
| What happens to Compton interactions as photon energy increases? | Decrease(higher kv=more transmission) |
| What is the relationship between the deflection of the photon and the energy it loses in Compton Scattering? | The greater the angle the more energy lost |
| In what type of tissue are Compton Interactions likely to occur? | They occur in all types |
| What interaction is the least desirable? | Compton effect |
| Why do we want to prevent the Compton Effect? | Doesn't contribute anything useful to our image, it produces fog & it is where the technologist gets most of their x-ray exposure |
| What is the photoelecric Effect? | Photon absorption interaction |
| What does the photoelectric effect occur between? | incident photons & innershell electrons of the target atom (atoms of tissue) |
| What happens to the photon in the Photelectric effect? | it tansferes all of it's energy to the electron and ceases to exist |
| What is the name of the electron that is ionized during the Photoelectric Effect? | Photoelectron |
| What is an ion pair in Photoelectric effect? | ionized atom & electron |
| What are the 2 kinds of secondary radiation in Photoelectric interactions? | Photoelectron & Characteristic Photon |
| What type of secondary radiation occurs when a low energy electron is released that can only travel through 1mm of tissue? | Photoelectron |
| What two interactions are of improtance in making an x-ray image? | Compton Effect & Photoelectric Effect |
| What is the name of the ejected electron a Compton Effect interaction? | Compton electron or Secondary electron |
| How do you figure the energy of the Compton scattered x-ray? | The difference between the energy of the incident x-ray and the energy of the ejected x-ray |
| How do you figure the energy of the ejected electron in Compton Scattering? | It's binding energy plus the kinetic energy with which it leaves the atom |
Created by:
Sukioshii