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Decontamination and Decommissioning of Uranium Facilities cont'd - hdbk1113cn10070
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Radiological Safety Training for Uranium Facilities - index
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Gamma and X-Ray External Dose - hdbk1113cn10072


DOE-HDBK-1113-98
Module 103 External Dose Control
Lesson Plan
Instructor's Notes
Show OT-25
III.
MODULE 103 - External Dose Control
Highlight the specific external
A.
Objectives
exposure hazards and controls at
your facilit y.
EO4
Identify the radiological concerns of external
exposur e to uran ium.
EO5
Describe the measures taken to control external
exposur e to uran ium.
B.
Alpha External Dose
Because of the relatively short range of alpha particles in
dense matter, alpha radiation poses little external dose
hazard. The most energetic alphas produced by naturally
occurring radionuclides will barely penetrate the dead layer
of skin on the human body. Little living tissue will be
affected when the alpha source is external to the skin.
C.
Beta External Dose
Show OT-26
Beta doses to the skin, extr emities, and t he lens of the eye
can be limiting in facilities which process unshielded
depleted, natural, or low-enrichment uranium. Processes
which separate and sometimes concentrate beta-emitting
uranium daughters are not uncommon in DOE uranium
facilities. Control of exposure is complicated by the fact
that considerable contact work takes place in facilities
which process uranium metal.
34


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