For all the threats of nuclear war of the decades since the end of WW II in 1945, the only time that nuclear weapons have been used in a conflict was the two that were dropped on Japan to end their participation in World War II. We know that there have been generals and even presidents who talked about the possible use of such weapons since WW II.
Ambient office = 71 nanosieverts per hour
Ambient outside = 78 nanosieverts per hour
Soil exposed to rain water = 66 nanosieverts per hour
There are many bodies of water in the world that are polluted with radioactive materials. Ground water may penetrate underground repositories and spread radioactive materials far beyond the storage facility. There are ways to deal with radioactive materials dissolved in water but there is no widespread cheap technique.
Ambient office = 92 nanosieverts per hour
Ambient outside = 99 nanosieverts per hour
Soil exposed to rain water = 104 nanosieverts per hour
Ambient office = 121 nanosieverts per hour
Ambient outside = 111 nanosieverts per hour
Soil exposed to rain water = 108 nanosieverts per hour
Ambient office = 67 nanosieverts per hour
Ambient outside = 151 nanosieverts per hour
Soil exposed to rain water = 143 nanosieverts per hour
