Glossary cont'd - DOE-HDBK-1109-97

DOE-HDBK-1109-97

Radiological Safety Training for Radiation-Producing (X-Ray) Devices

Student's Guide

GLOSSARY (continued)

Use factor: The fraction of the workload during which the useful beam is pointed in the direction under

consideration.

Useful beam: The part of the primary and secondary radiation that passes through the aperture, cone, or

other device used for collimation.

Very High Radiation Area: Any area accessible to individuals in which radiation levels could result in

an individual receiving an absorbed dose in excess of 500 rads (5 grays) in 1 hour at 1 meter from a

radiation source or from any surface that the radiation penetrates (10 CFR 835.2(a)).

Warning label: A label affixed to the X-ray device that provides precautions and special conditions of

use.

Workload: A measure, in suitable units, of the amount of use of radiation equipment. For the purpose of

this standard, the workload is expressed in milliampere-minutes per week for X-ray sources and in

roentgens per week at 1 meter from the source for gamma-ray sources and high-energy equipment (such as

linear accelerators, betatrons, etc.).

X-ray accessory apparatus: Any portion of an X-ray installation that is external to the radiation source

housing and into which an X-ray beam is directed for making X-ray measurements or for other uses.

X-Ray Device Control Office: A team that establishes X-ray device program requirements and standards,

provides X-ray device radiation protection consultation, and serves as the central point of contact for the

management/control of X-ray devices. This function may have a facility-specific name.

X-ray device custodian: A person designated by line management as responsible for specific X-ray

devices. This individual is responsible for designating the operators of specific X-ray devices, arranging

for the operators to attend X-ray safety training, assisting in the development and maintenance of the X-ray

device SOP, familiarizing operators with the X-ray device SOP, maintaining records of operator training

and safety interlock checks, serving as the point of contact for the line organization's X-ray devices, and

coordinating surveys with the X-Ray Device Control Office. An X-ray device custodian may also be an

X-ray device operator.