Radiological Health Support Operations
Pocket and electronic dosimeters are supplemental dosimeters that provide real-time indication of exposure to radiation
and assist in maintaining personnel doses less than administrative control levels.
Individuals entering a high radiation or very high radiation area shall be monitored by a supplemental dosimeter or
other means (e.g., stay-time tracking) capable of providing an estimate of the individual's deep dose equivalent
during the entry (see Article 334 for entry requirements) [see 835.502(a)(2)]. Supplemental dosimeters should also
be issued when planned activities could cause an individual to exceed 50 millirem or 10 percent of a facility
administrative control level from external gamma radiation in 1 work day, whichever is greater, or when required
by a radiological work permit. Pocket dosimeters should be selected with the lowest range applicable (typically 0-
200 mR) for anticipated personnel exposures.
Supplemental dosimeters should be worn simultaneously with the primary dosimeter and located in accordance with
Supplemental dosimeters should be read periodically while in use and should not be allowed to exceed 75 percent
of full scale.
Work authorized by written authorization should be stopped when supplemental dosimeter readings indicate total
dose or rate of exposure substantially greater than planned. The radiological control organization should be
consulted prior to continuation of work.
The energy dependence and radiation sensitivity of supplemental dosimeters, particularly to low-energy beta and
neutron radiation, should be considered in determining their applicability.
DOE encourages the use of electronic dosimeters for entry into high radiation areas or when planned doses greater
than 100 millirem in 1 work day are expected. An electronic dosimeter provides an early warning of elevated
exposure through the use of alarm set points at specified dose rates or integrated doses.
When the dose results from the pocket or electronic dosimeters differ by more than 50 percent from the primary
dosimeter result and the primary dosimeter result is greater than 100 millirem, an investigation should be initiated to
explain the difference.
514 Area Monitoring Dosimeters
Establishment and maintenance of a comprehensive area monitoring program can minimize the number of areas requiring
the issuance of personnel dosimeters and demonstrate that doses outside radiological areas are negligible. Minimizing
the number of personnel dosimeters issued saves in the costs of operating the dosimetry program and reduces costs
associated with maintaining personnel with enhanced training and qualifications.
Area monitoring dosimeters should be used to record and document radiation levels in routinely occupied areas
adjacent to areas where radiation or operations with radiation exist. This monitoring provision does not apply when
the radiation arises solely from low-energy beta sources (e.g., Carbon-14 or tritium).
Area monitoring dosimeter results should be used to support dosimetry investigations where individuals express
concerns about their work environments and exposure to ionizing radiation.
Area monitoring dosimeters should be used in controlled areas to supplement existing monitoring programs and to
provide data in the event of an emergency.
515 Nuclear Accident Dosimeters