Radiological Health Support Operations
The proper operation of continuous air monitoring equipment should be verified daily by performing an operational
check. Operational checks should include positive air-flow indication, non-zero response to background activity,
and internal check sources or 60 Hz electronic checks when available. Real-time air monitoring equipment operation
should be verified weekly by checking for instrument response with a check source or with ambient levels of radon
and thoron daughters.
Preliminary assessments of air samples utilizing field survey techniques should be performed promptly upon
removal. In situations where background levels of radon and thoron daughters interfere with evaluation of alpha air
samples, prompt field assessments may not be possible.
Air sample results should be evaluated as quickly as practicable for evaluation of the need for respiratory
protection, area evacuation (if necessary), worker intake, and worker relief from respirator use.