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|  DOE-HDBK-1131-98
General Employee Radiological Training
Instructor's Guide
B. Sources of Radiation (EO1)
EO1 - IDENTIFY basic radiological
fundamentals and radiation
People have always been exposed to
protection concepts.
radiation. Radiation, simply defined, is
energy emitted through space and
matter. We are exposed to radiation
from naturally-occurring sources in our
environment, man-made sources, and
even from materials inside our bodies.
OPTIONAL:
The average annual radiation dose
Explain that just as the inch is a
to a member of the general
basic unit to measure distance, the
population is about 360
rem is the basic unit of measure
millirem/year. This amount is a
used to equate the amount of
combination of both natural
potential biological damage done to
background and man-made sources
our bodies by radiation. (1 rem =
of radiation.
1000 millirem)
1. Natural background sources of
radiation
Natural background radiation is by
far the largest contributor (about 300
millirem/year) to radiation doses.
The main sources of natural
background radiation are listed
below:
a. Cosmic radiation - radiation from
the sun and outer space, varies
with altitude, (e.g., Denver would
be higher than Miami).
b. Radon - (the principal source of
background radiation exposure.)
A gas from naturally- occurring
uranium in the soil.
c. Terrestrial radiation from
naturally- occurring radioactive
material found in the earth's
crust, such as uranium found in
rocks and soil.
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