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Page Title:
Special controls and considerations at uranium Operations cont'd |
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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
C. Uranium metal in finely divided form is
pyrophoric; therefore, any grinding or milling
operations must be carefully conducted to avoid
fires.
Uranium hexafluoride is commonly found in
many uranium operations. This material is a
solid at room temperatures but volatilizes readily
at elevated temperatures. As a gas, it is
extremely hazardous, forming hydrofluoric acid
when it comes in contact with water. Operations
involving uranium hexafluoride must be
conducted very carefully to prevent release of
the gas.
D. External radiation hazards from uranium are
primarily associated with decay products;
therefore, operations in which the decay
products can separate and concentrate must be
monitored carefully. For example, crucibles
used to melt depleted uranium and casks used
to ship uranium hexafluoride are sometimes
more radioactive after they are emptied than
when they are full. The reason is that the decay
products are left in the emptying process and
are no longer self-shielded by the uranium.
Summarize lesson.
Review objectives.
Answer questions.
Module 6 12
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