Ambient office = 137 nanosieverts per hour

 

Ambient outside = 92 nanosieverts per hour

 

Soil exposed to rain water = 77 nanosieverts per hour

 

Romain lettuce from Top Foods = 92 nanosieverts per hour

 

Tap water = 86 nanosieverts per hour

 

Filtered water = 77 nanosieverts per hour