Enclosed-Beam System - hdbk110997

DOE-HDBK-1109-97

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

Instructor=s Guide

Lesson Plan

Instructor=s Notes

Shielding is provided.

(Add facility-specific examples.)

ii.

Enclosed-Beam System.

In an enclosed-beam system, all possible

X-ray paths (primary and diffracted) are

completely enclosed so that no part of a

human body can be exposed to the beam

during normal operation. Because it is

safer, the enclosed-beam system should be

selected over the open-beam system

whenever possible.

The following safety features are specified

by ANSI N43.2 for an enclosed-beam

X-ray system:

The sample chamber door or other

enclosure should have a fail-safe

interlock on the X-ray tube high-

voltage supply or a shutter in the

primary beam so that no X-ray

beam can enter the sample

chamber while it is open.

X-ray tube, sample, detector, and

analyzing crystal (if used) must be

enclosed in a chamber or coupled

chambers that cannot be entered

by any part of the body during

normal operation.