Operation; Principle Of Operation; Commission The Source Holder; Commissioning Call Checklist - Vega SHLG Operating Instructions Manual

Source holder

Table of Contents

Operation

The SHLG

source holders position and protect a radioactive source near a

process vessel or pipe. Radiation from the source is directed through the

process by an integral collimator. A radiation detector placed opposite the source

holder measures radiation fluctuations caused by process condition changes. The

detector correlates radiation levels to process conditions.

SHLG source holders operate by rotating the cylindrical shutter over a 90° range.

When the shutter is in the on position, a void slot in the shutter shielding permits the

radiation beam to exit the device. When the shutter is in the off position, the void slot

is perpendicular to the beam and blocks the beam from exiting the device.

Before any gauge is setup and adjusted, you must commission the source

holder. Depending on the source holder type and the specific license

requirements, the process of commissioning the source holder can include:

•

Inspecting the mounting supports.

•

Testing the source holder for any source material leakage.

•

Conducting open and closed radiation surveys.

•

Performing an occupancy evaluation.

See the Radiation Safety Manual for specific details.

NOTE

In many installations, a VEGA Americas Field Service Engineer commissions the

gauge. To reduce service time and costs, use this checklist to ensure the gauge is

ready for commissioning before the engineer arrives:

•

Allow access to the source holder for testing purposes.

39089-US-210509

Operation

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