Abstract
Transport across the gastrointestinal tract of adult rats was measured for the “soluble” nitrate and/or “insoluble” oxide compounds of 238Th, 232U 233U, 237Np, 237Pu, 239Pu, 239Pu, 241Pu, 241Am, 244Cm, 252Cf and 253Es. Absorption of plutonium and americium nitrates was compared in adult rats, guinea pigs and dogs; there was little variation among species. There was much greater variation between the absorption of different elements in the rat. Other factors observed to influence absorption were particle size, compound form and mass of compound administered.