25 notecards = 7 pages (4 cards per page)
Particles associated with electromagnetic radiation that have no mass or electric charge are:
Coherent scattering is most likely to occur ____________, even though some of this unmodified scattering occurs throughout the diagnostic range and may result in small amounts of radiographic fog.
below 10 keV
Which of the following is not a type of interaction between x-radiation and biologic matter?
The symbol Z indicates the:
atomic number of an atom
In photoelectric absorption to dislodge an inner-shell electron from its atomic orbit, the incoming x-ray photon must be able to transfer a quantity of energy:
as large as or larger than the amount of energy that binds the electron in its orbit
Which of the following interactions between photons and matter involves a matter-antimatter annihilation reaction?
The probability of occurrence of photoelectric absorption _________ as the energy of the incident photon decreases and the atomic number of the irradiated atoms _________.
increases markedly, increases
Which of the following terms refers to the radiation that occurs when an electron drops down from an outer orbit to fill a vacancy in an inner orbit of the parent atom?
Fluorescent radiation is also known as:
What is the effective atomic number of compact bone?
Which of the following is not another term for coherent scattering?
Which of the following are byproducts of photoelectric absorption?
Photoelectron and characteristic photon
Which two interactions between x-radiation and matter may result in the production of small-angle scatter?
Coherent scattering and Compton scattering
Which of the following particles is considered to be a form of antimatter?
Which of the following interactions results in the conversion of matter into energy?
Compton scattering is synonymous with:
During the process of coherent scattering, the incident x-ray photon interacts with a(n):
atom transferring its energy by causing some or all of the electrons of the atom to vibrate momentarily and radiate energy in the form of electromagnetic waves
What is the term for the number of x-rays emitted per inner-shell vacancy during the process of photoelectric absorption?
Which of the following results in all-directional scatter?
Annihilation radiation is used in which of the following modalities?
Positron emission tomography (PET)
The x-ray photon energy required to initiate pair production is:
Differences in density level between radiographic images of adjacent structures as seen in a completed radiograph define:
Radiographic density is:
defined as the degree of overall blackening on a completed radiograph
When a vacancy exists in an inner electron shell of an atom (as a result of photoelectric effect, Compton scattering, or bombardment by other electrons), the energy liberated when this vacancy is filled, instead of emerging from the atom as fluorescent radiation, can be transferred to another electron of the atom, thereby ejecting the electron. Such an emitted electron is called a(n) _____ electron.
X-rays are carriers of:
manmade, electromagnetic energy