Risk Calculation Analogies

["Mcelrath Susan S." <MCELRATHS@rscpo1.wilm.ge.com>]

I am looking for new and interesting ways to explain how radiation risks are 
determined. I'm particularly interested in analogies which relate risk 
calculations to common, everday, ordinary items. I'm looking for more than 
just relating radiation exposure risks to activities like driving a car, 
skydiving, etc. I'm looking for analogies to explain how risks are 
calculated (er, extrapolated) from exposure data.

I've heard the analogy comparing effects of taking a hundred aspirin all at 
once, and from that data determining the expected effects of taking one 
aspirin a day for a hundred days (though this analogy is somewhat lacking). 
 Any creative ideas out there?