Department of Energy (DOE) Radiological Control Manual

Chapter 3 - Conduct of Radiological Work

Appendix B - 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 a person could exceed a whole body dose of 1 rem in any one hour:

2. 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

3. A device that functions automatically to prevent use or operation of the radiation source or field while personnel are in the area

4. A control device that energizes a conspicuous visible or audible alarm signal so that the person entering the High Radiation Area and the supervisor of the activity are made aware of the entry

5. Entryways that are locked, except during periods when access to the area is required, with positive control over each entry

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

7. 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 personnel 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.

• Physical access controls over High and Very High Radiation Areas shall be established in such a way that does not prevent a person from leaving the area.