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DOE-STD-1098-99
Radiological Control
Conduct of Radiological Work
June 2004
Appendix 3B
Physical Access Controls for High and Very High Radiation Areas
1.
One or more of the following features should be used for each entrance or access point to a high radiation area and
shall be used for each entrance or access point to a high radiation area where radiation levels exist such that an
individual could exceed a whole body dose of 1 rem in any one hour [see 835.502(b)]:
a.
A control device that prevents entry to the area when high radiation levels exist or upon entry causes the
radiation level to be reduced below that level defining a high radiation area
b.
A device that functions automatically to prevent use or operation of the radiation source or field while
personnel are in the area
c.
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
d.
Entryways that are locked, except during periods when access to the area is required, with positive control
over each entry
e.
Continuous d irect or electronic surveillance that is capable of preventing unauthorized entry
f.
A control device that automatically generates audible and visual alarm signals to alert personnel in the area
before use or operation of the radiation source and in suffic ient time to permit evacuation of the area or
activation of a secondary control device that will prevent use or operation of the source.
2.
In addition to the above requirements, additional measures shall be implemented to ensure individuals are not able
to gain access to very high radiation areas when dose rates are in excess of the posting requirements of Table 2-3
[see 835.502(c)].
3.
Physical access controls over high and very high radiation areas shall be established in a manner that does not
prevent an individual from leaving the area [see 835.502(d)].
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