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129I determination by direct gamma-X spectrometry and its application to concentration variations in two seaweed species

Published online by Cambridge University Press:  17 June 2005

J.C. Barescut ,
J.C. Gariel ,
J.M. Péres ,
E. Barker ,
M. Masson ,
P. Bouisset ,
N. Cariou ,
P. Germain  and
F. Siclet
E. Barker
Affiliation:
IRSN/DEI/STEME/Environmental Radioactivity Measurement Laboratory, Bât. 501, Bois des Rames, 91400 Orsay, France, e-mail: [email protected]
M. Masson
Affiliation:
IRSN/DEI/SECRE/Octeville-Cherbourg Radioecology Laboratory, Rue Max Pol Fouchet, BP. 10, 50130 Octeville, France
P. Bouisset
Affiliation:
IRSN/DEI/STEME/Environmental Radioactivity Measurement Laboratory, Bât. 501, Bois des Rames, 91400 Orsay, France, e-mail: [email protected]
N. Cariou
Affiliation:
IRSN/DEI/STEME/Environmental Radioactivity Measurement Laboratory, Bât. 501, Bois des Rames, 91400 Orsay, France, e-mail: [email protected]
P. Germain
Affiliation:
IRSN/DEI/SECRE/Octeville-Cherbourg Radioecology Laboratory, Rue Max Pol Fouchet, BP. 10, 50130 Octeville, France
F. Siclet
Affiliation:
EDF, 6 quai Watier, 78401 Chatou Cedex, France
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Abstract

The quantification of radionuclides by direct gamma-X spectrometry with energy below 100 keV requires knowledge the elementary composition of the sample or the development of a device for determining the mass attenuation coefficients. This is especially true for 129I which is characterised by a 29.8 keV X-ray and 39.6 keV gamma ray. Experimental equipment has been developed in order to obtain this mass attenuation coefficient as a function of energy. 129I concentrations were measured in samples of seaweed (Fucus serratus and Laminaria digitata) collected monthly over a period of one year nearby La Hague reprocessing plant in France. This paper describes the measurement methodology used to determine 129I concentrations and variations in the two seaweeds over a one-year period. Mean mass attenuation coefficients for 129I energies were established in order to determine the self-attenuation corrective factor for both seaweed species, regardless of the sampling date.

Type
Research Article
Information
Radioprotection , Volume 40 , Issue S1 , May 2005 , pp. S581 - S587
Copyright
© EDP Sciences, 2005

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