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Radiation Protection Dosimetry Advance Access published online on March 26, 2009
Radiation Protection Dosimetry, doi:10.1093/rpd/ncp024
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

UNCERTAINTIES OF MAYAK URINE DATA

Guthrie Miller1,*, Vadim Vostrotin2 and Vladimir Vvedensky2

1 Los Alamos National Laboratory, Los Alamos, NM, USA
2 Southern Urals Biophysics Institute, Ozyorsk, Chelyabinsk, Russian Federation

* Corresponding author: guthrie{at}lanl.gov

Received December 1, 2008, amended February 10, 2009, accepted February 17, 2009

A method of parameterising the likelihood functions representing the uncertainty of Mayak plutonium urine bioassay measurements is described. The Poisson-lognormal model is assumed and data from 63 cases (1087 urine measurements in all) are used to empirically determine the lognormal normalisation uncertainty, given the measurement uncertainties obtained from count quantities. An outlier-insensitive procedure is used to fit the cumulative probability distribution of scaled deviations in order to determine the normalisation uncertainty. The natural logarithm of the geometric standard deviation of the total normalisation uncertainty is found to be 0.34 including a measurement component estimated to be 0.2.


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