Glossary cont'd - hdbk110997

DOE-HDBK-1109-97

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

Instructor=s Guide

Unattended installation: An industrial installation that consists of equipment designed and manufactured

for a specific purpose and that does not require personnel in attendance for its operation.

Units: In accordance with 10 CFR 835.4, for all radiological units, the quantities used for records required

by 10 CFR 835 shall be the curie (Ci), rad or rem. SI units, Becquerel (Bq), gray (Gy), and sievert (Sv)

may be included parenthetically for reference to scientific standards, but are not authorized for required

records. To convert conventional radiation units to SI units, the following factors are used:

1 rad = 0.01 gray (Gy)

1 rem = 0.01 sievert (Sv)

1 Ci = 3.7 X 1010 Bq

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.