[Code of Federal Regulations]
[Title 10, Volume 4, Parts 500 to end]
[Revised as of January 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR835.502]

[Page 463-464]
 
                            TITLE 10--ENERGY
 
                    CHAPTER III--DEPARTMENT OF ENERGY
 
PART 835--OCCUPATIONAL RADIATION PROTECTION--Table of Contents
 
                    Subpart F--Entry Control Program
 
Sec. 835.502  High and very high radiation areas.

    (a) The following measures shall be implemented for each entry into 
a high radiation area:
    (1) The area shall be monitored as necessary during access to 
determine the exposure rates to which the individuals are exposed; and
    (2) Each individual shall be monitored by a supplemental dosimetry 
device or other means capable of providing an immediate estimate of the 
individual's integrated deep dose equivalent during the entry.
    (b) Physical controls. One or more of the following features 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 deep dose 
equivalent to the whole body of 1 rem (0.01 sievert) in any one hour at 
30 centimeters from the source or from any surface that the radiation 
penetrates:
    (1) 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;
    (2) A device that functions automatically to prevent use or 
operation of the radiation source or field while individuals are in the 
area;
    (3) 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;
    (4) Entryways that are locked. During periods when access to the 
area is required, positive control over each entry is maintained;

[[Page 464]]

    (5) Continuous direct or electronic surveillance that is capable of 
preventing unauthorized entry;
    (6) A control device that will automatically generate 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.
    (c) Very high radiation areas. In addition to the above 
requirements, additional measures shall be implemented to ensure 
individuals are not able to gain unauthorized or inadvertent access to 
very high radiation areas.
    (d) No control(s) shall be established in a high or very high 
radiation area that would prevent rapid evacuation of personnel.

[58 FR 65485, Dec. 14, 1993, as amended at 63 FR 59684, Nov. 4, 1998]