Shielding

DOE-HDBK-1109-97

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

Instructor=s Guide

Lesson Plan

Instructor=s Notes

SHIELDING

Analytical Systems.

For analytical X-ray machines, such as X-ray

fluorescence and diffraction systems, the

manufacturer provides shielding in accordance

with ANSI N43.2. However, prudent practice

requires that any device or source that involves

radiation should be surveyed to determine the

adequacy of the shielding.

Enclosed beam systems have sufficient shielding

so that the dose rate at 5 cm from its outer surface

does not exceed 0.25 mrem per hour under

normal operating conditions. The dose rate may

be difficult to evaluate. According to ANSI

N43.2, this requirement is met if the shielding is

at least equal to the thickness of lead specified in

the following table for the maximum rated anode

current and potential.