Unattended Installation - hdbk110997

DOE-HDBK-1109-97

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

Student's Guide

(Add facility-specific examples.)

Unattended Installation.

An unattended installation consists of equipment designed and manufactured for a

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

Steps must be taken to ensure that the dose to personnel is less than 100

mrem/year. However, a short term limit of 2 mrem/hour may be used provided

the expected dose to personnel is less than 100 mrem/year.

(Add facility-specific examples.)

Open Installation.

vi.

An open installation has X-ray paths that are not enclosed. An example would be

a portable X-ray machine outdoors in an emergency response situation, with the

X-ray tube not enclosed inside a shielded room. This class is acceptable for use

only if operational requirements prevent the use of one of the other classes. Its

use is limited mainly to mobile and portable equipment where fixed shielding

cannot be used. The protection of personnel and the public depends almost

entirely on strict adherence to safe operating procedures and posting. High

Radiation Areas must either be locked (as in the shielded installation) or be under

constant surveillance by the operator. The perimeter of any Radiation Area

created by the system must be defined and posted.

According to ANSI N43.3, when the radiation source is being approached

following the conclusion of a procedure, the operator shall use a suitable

calibrated and operable survey instrument to verify that the source is in its fully

shielded condition or that the X-ray tube has been turned off.

(Add facility-specific examples.)