Model 3440-L B–5
B. RADIATION THEORY
RADIATION TERMINOLOGY
The radiation absorbed dose, or rad, is the unit of absorbed dose equal to
0.01 Joules/kg in any medium. To account for the effect of various types of
radiation on biological tissue, the roentgen equivalent man (rem) or, more
appropriate for Troxler operators, the millirem (mrem) is used when
measuring radiation dose. The unit rem is derived from scaling the
radiation absorbed dose (rad) by a quality factor (QF). One rad is equal to
the exposure of one rem of photon radiation. For example, the average
neutron energy of an americium-241:beryllium source is 4.5 MeV. The
quality factor (QF) for this radiation is about 10. The absorbed dose of 1
rad of neutron radiation produces a dose equivalent of (absorbed dose x
QF) 10 rem.
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