Appendix 3B Physical Access Controls for High and Very High Radiation Areas

DOE-STD-1098-99

Radiological Control

Conduct of Radiological Work

March 2005

Appendix 3B

Physical Access Controls for High and Very High Radiation Areas

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 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

A device that functions automatically to prevent use or operation of the radiation source or field while

personnel 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, except during periods when access to the area is required, with positive control

over each entry

Continuous direct or electronic surveillance that is capable of preventing unauthorized entry

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 sufficient time to permit evacuation of the area or

activation of a secondary control device that will prevent use or operation of the source.

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)].

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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