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Interference from Radon - hdbk1113cn10093
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Radiological Safety Training for Uranium Facilities - index
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Special Radiological Survey cont'd


DOE-HDBK-1113-98
Module 104 Internal Dose Control
Lesson Plan
Instructor's Notes
Radon is a radioactive gas that
occurs naturally in the
environment. It decays by alpha
emission in the first of a series of
very short half-life radionuclides
that dec ay by alpha or beta-ga mma
emission.
There is a si mple, inexpens ive
alternative to determine if the
contamination is due to radon. The
effective half-life for radon
radioactive decay products is about
30 minutes, compared with the
millions of years it takes for
uranium to decay. The simple way
to determine if contamination is
due to radon is to wait and see if it
goes away. The sample is
recounted after the radon has an
opportunity to decay to lower
levels. The count rates are
compared, and if the count rates are
significantly different, radon is the
most likely reason for the higher
initial count rate.
h.
Special Radiological Surveys and
Highlight the r adioactive
Techniques for Release of Materials with
contamination limits used for
the Potential for Uranium Contamination
release of materials and
57


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