Geiger Counter Readings in Seattle, WA on July 28, 2012

Ambient office = .106 microsieverts per hour

Tap water = .104 micosieverts per hour

Filtered water = .086 micosieverts per hour

Kirland salted butter = .083 micosieverts per hour

Ambient outside = .088 micosieverts per hour

Soil exposed to rain = .087 micosieverts per hour