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38 Foundation of Radiography
foundations of Radiography, radiographic equipment, and radiation safety
28
Medical
Professional
04/24/2012

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Term
ALARA
Definition
ALARA  concept  of radiation protection that  states that all exposures should be kept "as low as reasonabley achievable."
Term
anode
Definition
Positive electrode in the x-ray tube
Term
cathode
Definition
Negative electrode in the x-ray tube.
Term
contrast
Definition
Differences in degrees of blackness on a radiograph.
Term
density
Definition
Overall darkness or blackness of a radiograph.
Term
dental radiography
Definition
Process of making radiographys of the teeth and adjacent structures  exposure to radiographs.
Term
digital imaging
Definition
Filmless method of capturing an image and displaying it by using an image sensor, and electronic signal, and a computer to process and store image.
Term
dose
Definition
Specified quantity of a drug or medicine.
Term
electrons
Definition
Negatively charged particle in the atom.
Term
energy
Definition
The ability to do work.
Term
genetic effects
Definition
Effects of radiation that are passed on to future generations through genetic cells.
Term
image
Definition
Film-based or digitally produced recordings of anatomic images.
Term
image receptor
Definition
Recording medium for an image, normally film or a sensor.
Term
ion
Definition
An electrically charged particle.
Term
ionizing radiation
Definition
Radiation that produces ionization, resulting in harmful effects.
Term
latent period
Definition
Time between exposure of ionizing radiation and appearance of symptoms.
Term
kilovoltage peak
Definition
Highest voltage of radiograph tube used during a radiograph tube used during a radiograph exposure.
Term
penumbra
Definition
Blurred or indistinct area that surrounds an image.
Term
matter
Definition
Anything that occupies space and has form of shape.
Term
milliampere
Definition
One one-thousandth (1/1000) of an ampere, a unit of measurement  used to describe the intensity of an electrical current.
Term
Photon
Definition
A minute (tiny) bundle of pure energy that has no weight or mass.
Term
primary beam
Definition
The most penetrating beam produced at the target of the anode.
Term
radiation
Definition
Forms of waves of energy emission through space or material.
Term
radiograph
Definition
Image produced on photosensitive film by exposing the film to radiation and then processing it.
Term
radiology
Definition
The science or study of radiation as used in medicine.
Term
somatic effects
Definition
Effects of radiation that cause illness and are responsible for poor health (such as cancer, leukemia, and cataracts) but are not passed on to offspring.
Term
tungsten target
Definition
A focal spot in the anode.
Term

x-radiation

 or 

x-ray

Definition
High-energy ionizing electromagnetic radiation.
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