Internal dose control - DOE-HDBK-1141-2001

Radiological Assessor Training

DOE-HDBK-1141-2001

Student's Guide

B. Gamma radiation

Gamma radiation is normally not the controlling

factor at uranium facilities. However, significant

gamma fields can exist in areas where large

quantities of uranium are stored. Appropriate

actions including time, distance, and shielding

considerations should be taken to maintain

radiation doses ALARA.

C. Neutron radiation

Neutron radiation from enriched uranium fluoride

compounds should also be considered in

determining potential external radiation hazards.

VI.

Internal dose control

Intakes

In most uranium facilities, the primary radiological

hazard is the potential for internal intakes of

uranium. This hazard must be controlled by

appropriate facility and equipment design,

contamination control procedures, and protective

clothing.

Inhalation is the primary route of concern.

Uranium transported from the lungs is deposited

in the bone (22%), kidney (12%), or other tissues

(12%), or excreted (54%), according to

International Commission on Radiological

Protection (ICRP) Publication 30.

Control must be verified by a bioassay program.

Urinalysis is the most common technique, but

fecal analysis and in vivo monitoring may also be

appropriate.

Module 6 - 8