Which of the following statements regarding grids is correct?
a. They may be used with both intraoral and extraoral radiography.
b. They are composed of thin lead strips alternating with a radiolucent material.
c. They reduce the amount of radiation needed to produce an image.
d. They may add to the potential to increase film fog.
b. The grid, composed of lead strips alternating with a radiolucent material, is placed between the patient and the film to absorb scatter radiation and reduce film fog to improve image contrast.
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If an individual is covered by both Medicaid and Medicare:
A) Medicare is always primary. B) Medicaid is always primary. C) Medicaid is primary only if the individual is younger than 65. D) Medicare is primary only if the individual is younger than 65.
Radioactive materials that emit alpha, beta, gamma, and neutron forms of radiation are ____ types.
A. oxidizing B. spontaneously combustible C. ionizing D. nonionizing
The simplest units of all matter are _______________, and many of these are essential to life.
Fill in the blank(s) with the appropriate word(s).
An optical illusion caused by the overlapping of teeth that mimics decay is called the "Mach band effect."
Indicate whether the statement is true or false