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Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
deviation from the beam path. They are a
concern directly downstream of targets and
beam dumps.
B. Residual radioactivity (radioactivation)
Show OT 13.8.
Radioactivation is the process by which materials
become radioactive. It is commonly referred to
Obj. 7
as "induced radioactivity" or simply "activation."
Define radioactivation.
Generally energies above 10 MeV are needed to
activate materials.
Activated materials will continue to emit radiation
after shutoff of the beam. The length of time
depends on the half-life and quantity of the
activated element.
Obj. 8
1. Contaminated materials versus activated
Explain how contaminated
materials
material differs from activated
material with regard to
radiological concerns.
Contaminated materials are considered to be
items with removable surface contamination.
Activated materials are considered to be
volume contamination, meaning the
radioactive materials are dispersed
throughout the items.
Activated materials normally do not present a
potential loose contamination hazard except
during activities such as:
Grinding
Burning
Machining
Handling filters of coolant water
Activated materials are normally controlled
based on the residual external radiation dose
rate.
Module 14 9


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