Glossary of Terms
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- Radiation Units
- There are a number of units to measure radiation dose and exposure:
- rad or radiation absorbed dose
The amount of radiant energy absorbed in a certain amount of tissue.
- rem or roentgen-equivalent-man
A unit of measurement that takes into account different biological responses
to different kinds of radiation. The radiation quantity measured by the rem
is called equivalent dose.
- millirem
One thousandth of a rem, the unit for measuring equivalent dose.
- roentgen (R, r) (rent-gen, rent-chen)
The international unit of exposure dose for x-rays or gamma rays. Roentgens
are named after Professor Wilhelm Konrad Roentgen, the man who discovered
x-rays in 1895.
- sievert (Sv) (see-vert)
The unit for measuring ionizing radiation effective dose, which accounts for
relative sensitivities of different tissues and organs exposed to radiation.
The radiation quantity measured by the sievert is called effective dose.
- millisievert (mSv) (mill-i-see-vert)
One thousandth of a sievert, the unit for measuring effective dose.
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