A good quick look-up for biouptakes can be had with the 'DOSEFACT' program. It lists the ICRP organ doses, H-50, H-e, etc. doses and has a window that describes bio-fate of the nuclide. For info on it contact Kieth Eckerman at 105 Berwick Dr. Oak Ridge, TN 37830. Sorry I don't have a phone or Email address.