Ion chambers are plastic air filled cavities that are
used to measure radiation. Ions collected from the chamber provide a reading
that can be used to determine the "rad" output of a radiation source.
Inherent in the use of the
chamber is the need for the chamber to be calibrated. These calibrations are
provided by a laboratory which is certified by the National Institute of
Standards and Technology.
The National Institute of
Standards and Technology is a federal technology agency that develops and
promotes measurement, standards, and technology.