Geiger Counter Readings in Seattle, WA on July 24, 2012
Ambient office = .095 microsieverts per hour
Tap water = .140 micosieverts per hour
Filtered water = .129 micosieverts per hour
Zone bar from supermarket = .089 micosieverts per hour
Ambient outside = .106 micosieverts per hour
Soil exposed to rain = .121 micosieverts per hour