Conduct of Radiological Work
Guidelines for Personnel Contamination Monitoring
with Hand-Held Instruments
Verify that the instrument is in service, has a valid source check, is set to the proper scale, and the audio output
can be heard during frisking.
Hold probe less than 1/2 inch from surface being surveyed for beta and gamma contamination, approximately
1/4 inch for alpha contamination.
Move probe slowly over surface, approximately 2 inches per second.
If the count rate increases during frisking, pause for 5 to 10 seconds over the area to provide adequate time for
If the count rate increases to a value greater than a preestablished contamination limit or the instrument alarms,
remain in the area and notify radiological control personnel.
The whole body frisk should take at least two to three minutes.
Performance of Monitoring:
Frisk the hands before picking up the probe.
Perform the frisk in the following order:
Head (pause at mouth and nose for approximately 5 seconds)
Neck and shoulders
Arms (pause at each elbow for approximately 5 seconds)
Chest and abdomen
Back, hips and seat of pants
Legs (pause at each knee for approximately 5 seconds)
Shoe bottoms (pause at sole and heel for approximately 5 seconds)
Personnel and supplemental dosimeters.
Return the probe to its holder and leave the area. The probe should be placed on the side or face up to allow
the next individual to monitor his/her hands before handling the probe.