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The weather station outside of the Atomic Testing Museum on a hot summer day.

Background radiation

http://en.wikipedia.org/wiki/Background_radiation
A banana equivalent dose (abbreviated BED ) is a nonstandard unit of radiation exposure, ostensibly defined as the additional dose a person will absorb from eating one banana . The concept is based on the fact that bananas, like most organic material, naturally contain a certain amount of radioactive isotopes —even in the absence of any contamination due to human nuclear endeavors. http://en.wikipedia.org/wiki/Banana_equivalent_dose

Banana equivalent dose

http://www.nti.org/analysis/articles/radiological-nuclear-detection-devices/

Issue Brief: Radiological and Nuclear Detection Devices

"The U.S. government's quest to defend the nation against a smuggled nuclear weapon or radiological "dirty" bomb is approaching a crossroads.

Sievert

The sievert (symbol: Sv) is the International System of Units (SI) derived unit of equivalent radiation dose , effective dose , and committed dose . Quantities that are measured in sieverts are designed to represent the stochastic biological effects of ionizing radiation . http://en.wikipedia.org/wiki/Sievert
Becoming Aware of Radiation Sources:

Tobacco Smoke | Radiation Protection

http://www.epa.gov/rpdweb00/sources/tobacco.html