At 09:21 AM 1/2/97 -0600, you wrote: >Help! I've done something wrong here: > >(roughly) 20,000,000 lb x 500 g/lb = 10 x 10^9 g ? >4.5 x 10^9 uCi / 10 x 10^9 g = .45 uCi/g ? lower than dirt? Now I'm confused. Dirt has more than .45 uCi/g radium? Keith Welch Thomas Jefferson National Accelerator Facility Newport News VA welch@cebaf.gov