Geiger Counter Readings in Seattle, WA on August 11, 2012

Ambient office = .109 microsieverts per hour

Tap water = .119 micosieverts per hour

Filtered water = .095 micosieverts per hour

Red onion from local produce stand = .079 micosieverts per hour

Ambient outside = .110 micosieverts per hour

Soil exposed to rain = .105 micosieverts per hour