Module 104 Internal Dose Control
MODULE 104 - Internal Dose Control
Highlight the specific internal
exposure hazards and controls at
your facilit y.
Identify the modes of entry into the body for
Describe the measures taken to control intakes of
uranium, including special radiological surveys and
techniques, instruments, and release of materials.
Internal Exposure to Uranium
As discussed in Module 101, the primary biological hazard
is the potential for uranium to be taken into the body. This
exposure may result in heavy metal poisoning, including
kidney damage (for acute exposures), or an increased
cancer risk (for chronic exposures). Uranium may enter the
body through inhalation, ingestion, absorption through the
skin, or injection into the bloodstream, such as from
contamination of an open wound.
The most common route of entry is inhalation, but much of
the material inhaled does not stay in the l ungs. The lungs
and related air passages constantly work to remove all the
dust we breathe, including dust that contains uranium. The
dust expelled from the lungs but not exhaled is swallowed,
so some of the inh aled uraniu m ends up in the di gestive