Radiation Protection Dosimetry Advance Access originally published online on March 28, 2008
Radiation Protection Dosimetry 2008 130(4):503-509; doi:10.1093/rpd/ncn094
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A study of early Los Alamos internal exposures to plutonium
Los Alamos National Laboratory, MS-M992, Los Alamos, NM 87545, USA
* Corresponding author: mcnaughton{at}lanl.gov
Received December 14, 2007, amended February 27, 2008, accepted February 27, 2008
Internal dose caused by exposure to 239Pu/240Pu is calculated for a group of 210 former Los Alamos workers who participated in the urine bioassay programme during the years 1944–45. An iterative Bayesian procedure is employed, where the distribution of intake amounts resulting from an initial calculation is used to define a prior probability distribution of inhalation intakes for an iterated second calculation. The urine bioassay data from this time period were not of high quality, and the more accurate intake prior tempers the effect of spurious high samples, which were probably caused by sample contamination.