Energy is greater than 10 MeV.  Does not occur in diagnostic radiography.

- Occurs when x-rays in the diagnostic range undergo ionization interactions with INNER SHELL ELECTRONS - Responsible for producing contrast on the radiograph - only occurs if the incident x-ray has energy equal to or greater than the electron binding energy

Characteristic x-rays may consist of __________ and behave as __________

- This interaction in tissue can occur in all x-rays and therefore of considerable importance in X-ray imaging. - Results in occupational exposure for radiologic technologists.

are produced after photoelectric interaction

The energy of the ejected electron is ____ to its binding energy plus the kinetic energy with which it leaves the atom.

________ scattering is of little importance in diagnostic radiology as it involves low energy x-rays and does not contribute to medical image production ________ Scattering - involves a single electron in the interaction ________ Scattering - results from a cooperative interaction with all the electrons of an atom

The higher the energy of x-rays, the ________ the wavelength

The incident ____ interacts with the _______ causing it become excited.

Atomic Number of Fat - Tissue - Lung - Bone -

electrons removed from the atom and escapes with kinetic energy equal to the difference between the energy of the incident x-ray and the binding energy of the electron

As mass density of absorber increases there will be _______ increase in compton scattering

_______ fills in the vacant space accompanied by emission of x-rays

_________ reduces image contrast (Increases Image Fog)

The result of COHERENT SCATTERING is a change in ______ of the x-ray without a change in its ________

wavelengths of X-rays

What happens to the Photoelectron kinetic energy when dealing low atomic number?

Some coherent scattering occurs at __ kVp and contributes slightly to image noise which reduces image contrast

2 out of 5 ways/mechanisms that are most important in diagnostic imaging radiography

This type of x-rays are absorbed photoelectrically.

Electron energy with unit during pair production

energy (with unit) needed by x-rays to escape interaction and be absorbed directly by the nucleus

Atomic Number of Others Concrete - Molybdenum - Tungsten - Lead -

__________ loses all of its kinetic energy through ionization and excitation and drops into a vacancy in an electron shell previously created by some other ionizing event.

Effect of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photo-disintegration -

Most coherently scattered x-rays are scattered in the what direction?

As x-ray energy increases with loosely bound electrons there will be increased what?

Direction of the scattered x-ray is _______ from that of the incident x-rays (different or same)

2 particles produced by x-ray when they disappear during pair production

Energy of these characteristic x-rays is inverse to the difference between binding energies of the shells involved. TRUE OR FALSE

Occurs when x-rays throughout the diagnostic range undergo interactions with the outer shell electrons that not only scatters the x-ray, but also reduces its energy.

X-rays that are scattered back in the direction of the incident x-ray beam

what do X-rays interact through matter as

Part of Interaction of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photo-disintegration -

5 Mechanisms For X-Ray Interaction

What happens to the Photoelectric kinetic energy when dealing with High Atomic Number

X-rays that tend to interact with whole atoms

What do you call the outer shell electron ejected by incident x-rays?

- Does not occur during x-ray imaging. - Occurs when x-rays have sufficient energy to escape electron interaction and come close enough to the nucleus of an atom. - Observed in Positron Emission Tomography.

This immediately releases this excess energy as a scattered x-ray with wavelengths equal to that of the incident x-ray and therefore of equal energy.

Incident x-ray energy with unit during pair production

Difference of Compton and Photoelectric Effect

Ejection of K-shell photoelectron by _______ results in vacancy in the K-shell.

X-rays that generally interact with electrons

Energy of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photodisintegration -

Product of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photo-disintegration -

X-rays that interact with nuclei

The process called when a positron unites with a free electron and the mass of both particles is converted into energy

Coherent Scattering was discovered by ___________ also known as _______ or ________ scattering Energy below ___ keV

Atomic number of contrast materials? Air - Iodine - Barium -

Xrays have very _____ wavelengths