Radiation is the emission and propogation of energy through space or a substance in the form of waves or particles. Radioactivity is the process by which certain unstable atoms or elements undergo spontaneous degeneration, or decay, in an effort to attain a more balanced nuclear state
both statements are true
Lead-lined cylinder that extends from the opening of the metal housing of the tubehead; it aims and shapes the x-ray beam
PID - position indicating device
What is the source in the x-ray tubehead that supplies enough energy to generate x-rays?
Cathode - or negative electrode
What is the purpose of the positive anode?
to convert electrons into x-ray photons
What type of radiation is most detrimental to the pt and radiographer?
What type of x-ray interaction is responsible for producing densities on film and making dental radiographs possible?
X-rays that pass through the pt with no interaction with matter
What effect does an increase of kVp have on a film?
A film with low contrast is useful for the detection of _________ and a film with low contrast has many shades of ________
periodontal disease or periapical disease
the quantity of electrons at the cathode
true or false. Milliamperes x exposure time (sec) = milliamperes/second
How does miliamperage affect density of a film?
an increase in mA increases the density
What percent of the total electron energy produced is converted to x-rays?
Collimation of the x-ray beam does what to the primary beam?
decreases the diameter of the primary beam
true or false. A primary use of the intensifying screen used in radiography is to reduce the exposure time
Which of the following devices are used to reduce radiation exposure to the pt?
all of the above
What are the correct mA and kVp settings used on a pt?
How many x-ray impulses occur in 1 second?
How will the film appear if you increase the source to film distance?
a form of secondary radiation that is the result of an x-ray beam that has been deflected from its path by the interaction with matter
At the atomic level, which type of radiation effect accounts for most of the scatter radiation that takes place?
Which of the following results in the greatest radiation exposure reduction?
fast emulsion speed
fast emulsion speed
radiation that is capable of producing ions by removing or adding an electron to an atom
The propgation of wave-like energy (without mass) through space or matter, including; cosmic rays, gamma rays, x-rays, ultraviolet rays, visible light, infrared light, radar waves, microwaves, and radio waves
Low frequency electromagnification has _____ wavelength and ______ energy, and high frequency electromagnification has _____ wavelenth and _______ energy
weightless bundles of energy without an electrical charge that travel in waves with a specific frequency at the speed of light
The number of electrons passing through the cathode filament is adjusted by what?
The current passing from the cathode to the anode is controlled by what?
The distance from the source of radiation to the pt's skin
distance from the source of radiation to the tooth
distance from the source of radiation to the film
The intensity of the x-ray beam is __________ as the distance increases