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Enhancing Nuclear Safety


Research

Publications

The limitations of dosimetry after internal contamination


Congress title :SFRP 2007
Congress town :Reims
Congress date :19/06/2007
Journal title: Radioprotection Volume 42 issue 4 Pages: 501-517

Document type > *Congrès/colloque

Keywords > dose, dose calculation, dosimetry, internal dosimetry, internal exposure

Research Unit > IRSN/DRPH/SDI/LEDI

Authors > BLANCHARDON Eric, FLURY-HERARD Anne, PAQUET François

Publication Date > 21/12/2007

Summary

The assessment of absorbed, equivalent and effective dose after internal exposure is based on activity measurement by in vivo counting or bioassay. A dose value is derived from this measurement by means of biokinetic and dosimetric models which describe the behaviour of radionuclides in the body of a reference man and the subsequent deposition of energy. To enforce regulatory dose limits, monitoring programs are designed and doses can be estimated from the measurement data according to a standard procedure as proposed by the IDEAS group. However, a significant uncertainty is associated with the dose estimate, due to the errors of measurement, the incomplete knowledge of the conditions of exposure and the imperfect realism of the models. In addition to this uncertainty, the extrapolation to low dose of biological effects observed at higher dose, the chemical toxicity of radionuclides and the heterogeneous energy deposition make the estimation of the risk following an internal exposure very difficult. As a conclusion, it should be reminded that the effective dose is a tool for the management of radiological protection but not an indicator of the individual risk.

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