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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Radiation_units
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1992-09-02
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Units of measurement for radioactivity and
radiation doses. Continued use of the units
introduced earlier this century (the curie,
rad, rem, and roentgen) has been approved
while the derived SI units (becquerel, gray,
sievert, coulomb) become familiar. One curie
equals 3.7 X 10^-10 becquerels (activity);
one rad equals 10^-2 gray (absorbed dose);
one rem equals 10^-2 sievert (dose
equivalent); one roentgen equals 2.58 x 10^-4
coulomb/kg (exposure to ionizing radiation).
The average radiation exposure per person per
year in the USA is 0.1 rem, of which 50% is
derived from naturally occurring radon.