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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Student's Guide
source or from any surface that the
radiation penetrates.
If an individual receive a deep dose
equivalent exceeding 1.0 rem in an hour
(at 30 cm), a High Radiation Area shall
have one or more of the following:
A control device that prevents entry to
the area when high radiation levels
exist or that, upon entry, causes the
radiation level to be reduced below
that level that defines a High Radiation
Area.
A device that functions automatically to
prevent use or operation of the
radiation source or field while
individuals are in the area.
A control device that energizes a
conspicuous visible or audible alarm
signal so that the individual entering
the High Radiation Area and the
supervisor of the activity are made
aware of the entry.
Entryways that are locked. During
periods when access to the area is
required, positive control over each
entry is maintained.
Continuous direct or electronic
surveillance that is capable of
preventing unauthorized entry.
A control device generating audible
and visual alarm signals to alert
personnel in the area before use or
operation of the radiation source and
in sufficient time to permit evacuation
of the are or activation of a secondary
control device that will prevent use or
operation of the source.
Module 2 - 13
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