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Communication Dans Un Congrès Année : 2019

In vivo monitoring intercomparisons: the CAThyMARA and EURADOS experiences

Résumé

The CAThyMARA project aimed at improving child thyroid monitoring in the event of accidental release. Among other topics an intercomparison of thyroid monitoring was carried out for spectroscopic and non-spectroscopic devices. For that purpose, thyroid phantoms corresponding to the adult, 10 and 5 years-old children were circulated in Europe. The activities were unknown for participants, for spectroscopic devices 133Ba was used as a substitute of 131I while a mixture of 137Cs and 133Ba and a silver filter were used for non-spectroscopic devices. A total of 72 devices have been tested, of which 43 non-spectroscopic devices. The results are encouraging, for example, 11/38 of non-spectroscopic devices were out of the ISO criteria in the case of the 5 years-old case. While in vivo intercomparision usually focused on spectrometers it was shown that dosemeters or count-rate meters performed as well as spectroscopic devices. The EURADOS working group 6 (computational dosimetry) and 7 (internal dosimetry) have also carried out intercomparisons of efficiency measurements and Monte-Carlo efficiency calculations. Between 2007 and 2016 the cases of 241Am in two different leg phantoms and in three skulls have been considered as well as the case of enriched uranium in lungs. In each case most of participants managed to compute the counting efficiency, eventually after interaction with the organizers. Each of this exercise revealed specific problems, for example error in the activity certificate or measurements at the wrong positions.
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Dates et versions

irsn-04021493 , version 1 (09-03-2023)

Identifiants

  • HAL Id : irsn-04021493 , version 1

Citer

David Broggio, Didier Franck, Jose-Maria Gomez-Ros, Mats Isaksson, Anne-Laure Lebacq, et al.. In vivo monitoring intercomparisons: the CAThyMARA and EURADOS experiences. European Radiation protection week, Oct 2019, Stockholm, Sweden. ⟨irsn-04021493⟩

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