This can also be interpreted to be ~ 1.4 times the amount of radiation one receives each year from background sources of radiation (assuming 360 mrem/yr.). or equivalent to less than 1.5 years of radiation exposure from natural sources that we are all exposed to. Just a suggestion, William Lorenzen Children's Hospital Boston, MA 617-355-7516 lorenzen_w@a1.tch.harvard.edu