TCDHA Rad Final
radiation is defined as - Answer- a form of energy carried by waves or streams of particles
a radiograph is defined as - Answer- a picture on film produced by the passage of x-rays through an object or body
why are dental images important - Answer- many dental diseases are...
TCDHA Rad Final
radiation is defined as - Answer- a form of energy carried by waves or streams of
particles
a radiograph is defined as - Answer- a picture on film produced by the passage of x-
rays through an object or body
why are dental images important - Answer- many dental diseases are typically
discovered only through the use of dental images
who modified the paralleling technique with the introduction of the long-cone
technique - Answer- F. Gordon Fitzgerald
which of the following would you place in the patients mouth in order to take dental x-
rays - Answer- image receptor
the orbiting shell closest to the nucleus has the highest energy level - Answer- true
the binding energy or binding force of an electron is - Answer- determined by the
distance between the orbiting electrons and the nucleus
ionization - Answer- an atom that gains an electron has a negative charge, and an
atom that loses an electron has a positive charge
ionizing radiation - Answer- radiation that is capable of producing ions by removing
or adding an electron to an atom
Heat is a byproduct of x-ray production. Which component of the x-ray tubehead
dissipates the heat created by the production of x-rays? - Answer- insulation oil
the head collimator - Answer- restricts the size of the x-ray beam
which would you adjust if you wanted to create a larger electron cloud - Answer- mA
in dental radiography, the term .......... is used to describe the mean energy or
penetrating ability of the x-ray beam - Answer- quality
(1) density is the overall darkness or blackness of a dental image (2) when the
kilovoltage is increased while other exposure factors rain constant, the resultant
image exhibits a decreased density and appears lighter - Answer- first statement is
true; the second statement is false
mA regulates the ........... of electrons produced at the cathode filament - Answer-
quantity
according to the inverse square law, if the length of the PID is halved, the resultant
beam ............. as intense - Answer- one quarter
, (1) as kV, mA, and time increases, x-ray beam intensity decreases (2) as distance
and filtration increase, the intensity of the x-ray beam increase - Answer- both
statements are fals
refers to the total amount of radiation that is received or absorbed - Answer- total
dose
(1) more radiation damage takes place with high dose rates (2) because a rapid
delivery of radiation does not allow time for cellular damage to be repaired - Answer-
both statements are true
what should you do prior to taking x-rays to protect your patient from radiation
exposure - Answer- proper prescribing of radiographs
the thyroid collar - Answer- is recommended for all intraoral exposures
the lead apron - Answer- is recommended for intraoral exposures
on some dental x-ray machines, only the .......... can be altered; the other parameters
are preset by the manufacturer - Answer- exposure time
a film badge - Answer- is worn at waist level by the operator
the ........ allow for positioning of the tubehead - Answer- extension arm
during an exposure - Answer- the exposure button is firmly depressed until the
preset exposure time is completed
what intraoral receptor holders is a disposable styrofoam-bite block? - Answer- state
bite-block
features of the state bite-block include - Answer- a slot for receptor retention
the rinn XCP is a - Answer- beam alignment device
the adhesive layer is added to the .......... before the ....... is applied - Answer- film
base; emulsion
the latent image is stored by the ........ in dental x-ray - Answer- silver halide crystals
what is the purpose of the lead foil sheet found within the film pocket? - Answer- to
shield the film from secondary backscattered radiation
then you are placing the film packet in your patients mouth, which side of the film
packet would you place toward the patients teeth? - Answer- the solid white side
the label side of the dental film packet - Answer- Is color-coded to distinguish
between one-film and two-film packets and between film speeds
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