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## Homework Statement

Suppose that you wish to find out how much gasoline is in an underground storage tank. You pour in one gallon of gasoline that contains some half-life radioactive material that causes a Geiger constant to register 48400 counts per minute above background radiation. The next day you remove a gallon from the underground tank and measure its radioactivity to be 100 counts per minute above background

## Homework Equations

none

## The Attempt at a Solution

The only formula that comes to mind is N=n0e^(kt), so I solved for the decay rate to be .00429 counts/min. But I'm not quite sure how to connect it to the gallons of gasoline.