Measurements of actinide gut-transfer factors in humans.

Abstract Measurements have been made of the gastrointestinal absorption in humans of 239 Np and 242 Cm administered together in citrate media. Using five volunteers, consistent results of (2.0 ± 0.2) × 10 −4 and (1.7 ± 0.3) × 10 −4 were obtained for Np and Cm respectively; the quoted uncertainties are the standard errors of the means. A progress report is given of work to measure the f 1 value for Pu in humans. Early work suggests an f 1 value of 2 × 10 −4 .