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  • With the audio on, move the probe slowly across the surface you want to monitor.

  • The probe should be - 1 inch above surface. Do not let the probe contact the surface as this could lead to contamination of the probe. Do not cover the probe with plastic bags, aluminum foil, or anything else as this will decrease the efficiency of the probe.

  • Listen to the audio. If an increase above background is noted, go back to that spot and take a longer count.

  • Decontaminate any areas greater than background. Dry wipe the area first. If still contaminated, soap and water is very effective for removing most surface contamination.

  • If you want information on decontamination, call the RSO at 206.543.6328.

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