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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
Show OT 6.4.
B. Radioisotopes
The primary radioisotopes of uranium are all
long-lived alpha-emitters. The specific activity
(Ci/g) of uranium increases as enrichment
increases; therefore, enriched uranium is a more
serious radiation hazard.
In most uranium facilities, the inhalation hazard
from alpha particles released in the respiratory
tract is the predominant radiological hazard
associated with the alpha emitting uranium
isotopes. In addition, uranium decay products
are primarily beta-emitters. For external
exposure, the major concern is the high-energy
beta particle from Protactinium-234m (2.29
MeV). As a result of beta radiation, the typical
contact dose with a block of uranium is
approximately 200 mrad/hr.
Trace contaminants such as Technetium-99 and
Uranium-232 may result in additional external
radiation dose when present.
As a result of the alpha-neutron reaction, casks
of enriched uranium hexafluoride may also emit
neutrons. Typical dose rates are on the order of
a few mrem/hr.
Module 6 5
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