Radioactive krypton, Kr-85 1, has been used for measuring the rate of rare-gas clean-up in pre-T.R. valves, with promising results. Krypton-85 has a half-life of ten years and emits mainly beta ...

For most of the year, in most of America, E85 means a fuel blend that it 85 percent ethanol and 15 percent gasoline. But, don't think that the E85 brand label means the the fuel in the pump is ...