Geiger Counter Readings in Seattle, WA on September 5, 2012

Ambient office = .107 microsieverts per hour

Ambient outside = .096 microsieverts per hour

Soil exposed to rain = .076 microsieverts per hour

White onion from grocery store = .090 microsieverts per hour

Tap water = .116 microsieverts per hour

Filtered water = .094 microsieverts per hour