Most hand-held survey instruments are calibrated to a
Cesium-137 source. Correction factors for the specific
radionuclide being monitored should be known when
surveying. Often the survey instrument will over or
under respond when monitoring for beta or alpha
3. Pre-operational Checks
Perform pre-operational checks before work:
Confirm calibration is current.
Verify that battery is OK.
Perform an audio check (audio response is
immediate, while needle response takes time to
Ensure instrument responds to source.
Explain that there is a
statistical variation in count
Verify that background count rate is normal.
rates and demonstrate this
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