Claude, Kocher (DOE/TIC-11026) gives the equilibrium dose constant for tritium as 0.0121 rad gm/(microCi hr). It follows that 10,000 pCi/L would produce a dose rate of about 0.121 micro-rad/hr to the water. The dose rate to the person, of course, would be much less. Is there a need to refine the calculation further? Charlie Willis caw@nrc.gov