The doserate at contact with a depleted U source of infinite density, ~1/8 inch, is 230 mrad/h, essentially all of it due to betas (minor xray component), Emax=2.3MeV. Thus an 80h exposure would result in a dose of 18.4 cGy (rad), neglecting any attenuation by the cladding (of which I shall not guess at the composition). chris alston ccja@aol.com