General guidelines for the assessment of internal dose from monitoring data: progress of the IDEAS project

Abstract

In recent major international intercomparison exercises on intake and internal dose assessments from monitoring data, the results calculated by different participants varied significantly. Based on this experience the need for harmonisation of the procedures has been formulated within an EU 5th Framework Programme research project. The aim of the project, IDEAS, is to develop general guidelines for standardising assessments of intakes and internal doses. The IDEAS project started in October 2001 and ended in June 2005. The project is closely related to some goals of the work of Committee 2 of the ICRP and since 2003 there has been close cooperation between the two groups. To ensure that the guidelines are applicable to a wide range of practical situations, the first step was to compile a database of well-documented cases of internal contamination. In parallel, an improved version of an existing software package was developed and distributed to the partners for further use. A large number of cases from the database was evaluated independently by the partners and the results reviewed. Based on these evaluations, guidelines were drafted and discussed with dosimetry professionals from around the world by means of a virtual workshop on the Internet early in 2004. The guidelines have been revised and refined on the basis of the experiences and discussions in this virtual workshop. The general philosophy of the Guidelines is presented here, focusing on the principles of harmonisation, optimisation and proportionality. Finally, the proposed Levels of Task to structure the approach of internal dose evaluation are reported.

ICRP Publication 130: Occupational Intakes of Radionuclides: Part 1

“…A European project in the European Commission 5 th Framework Programme was established to give general guidelines for the estimation of committed dose from the incorporation of monitoring data (IDEAS project). The IDEAS project developed a structured approach to the interpretation of individual monitoring data (Doerfel et al, 2006(Doerfel et al, , 2007Castellani et al, 2013), building on the proposals made by the ICRP Working Party on Dose Assessment (Fry et al, 2003). This guidance has been further developed by the European Radiation Dosimetry Group (Marsh et al, 2008;Lopez et al, 2011b).…”

“…In cases where multiple types of bioassay datasets are available, it is recommended that intake and dose should be assessed by fitting predicted values to the different types of measurement data simultaneously. For example, if urine and faecal datasets are available, the intake is assessed by fitting appropriately-weighted predicted values to both datasets simultaneously (Doerfel et al, 2006(Doerfel et al, , 2007ISO, 2011;Castellani et al, 2013).…”

Interprétation des résultats de surveillance individuelle des expositions professionnelles au dioxyde d’uranium « Proposition de dosimétrie collective »

“…En accord avec les recommandations du guide pratique résultant du contrat européen IDEAS (Doerfel et al, 2006), l'incertitude sur l'analyse des excrétions urinaire et fécale A pro est supposée de type lognormale avec un écart-type géométrique de 1,6 pour les analyses urinaires et de 3 pour les analyses fécales. Lognormal distribution parameters modelling the variability of excreted uranium from dietary intake.…”

Les méthodes et les limites de la dosimétrie après contamination interne

“…Pour palier cette situation, le projet européen IDEAS propose une approche structurée visant à harmoniser la procédure d'estimation de la dose résultant d'une contamination interne (Doerfel et al, 2005(Doerfel et al, , 2006. En cours d'adoption par la CIPR (Stather, 2007), elle distingue 4 niveaux de complexité dans l'évaluation de la dose efficace engagée, à appliquer en fonction de l'ordre de grandeur de dose attendu :…”