William Lorenzen wrote: > Yes there is segrigation!!! The surface of a fresh > casting (800+ kgs) can be 20 > or more R/hr... contact dose rate mostly from the > Protactinium (234) beta's >>>>>>> What's the conversion for beta particle radiation to R/hr? SI units may work better here. -- High Plains Drifter Fairfield, CA ddchaney@castles.com