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Digital autoradiography on C-14-labelled PMMA impregnated rock samples using the BeaverTM

Published online by Cambridge University Press:  26 February 2018

Mikko Voutilainen ,
Juuso Sammaljärvi ,
Eveliina Muuri ,
Jérôme Donnard ,
Samuel Duval  and
Marja Siitari-Kauppi
Mikko Voutilainen*
Affiliation:
Department of Chemistry, University of Helsinki, 00014, Helsinki, Finland.
Juuso Sammaljärvi
Affiliation:
Department of Chemistry, University of Helsinki, 00014, Helsinki, Finland.
Eveliina Muuri
Affiliation:
Department of Chemistry, University of Helsinki, 00014, Helsinki, Finland.
Jérôme Donnard
Affiliation:
AI4R, 2 Alfred Kastler, 44307, Nantes, France.
Samuel Duval
Affiliation:
AI4R, 2 Alfred Kastler, 44307, Nantes, France.
Marja Siitari-Kauppi
Affiliation:
Department of Chemistry, University of Helsinki, 00014, Helsinki, Finland.
*
*(Email: [email protected])
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Abstract

In Finland and Sweden the KBS-3 concept has been chosen for the disposal of spent nuclear fuel in crystalline rock. Recent experiments have shown that heterogeneity of rock may play a major role in the transport of radionuclides. Autoradiographic methods have been proven to be able to assist the characterization of heterogeneous structures. In this study we tested a novel filmless autoradiographic device called BeaverTM which applies a micro patterned gaseous detector in order to quantitatively map beta emissions from C-14 atoms. The studied samples were impregnated with C-14-labelled methylmethacrylate (C-14-MMA) and polymerized to C-14-PMMA with thermal initiator. The BeaverTM was then used to determine the spatial distribution of the C-14-PMMA by measuring the C-14 emissions. The porosity is determined from the amount of C-14-PMMA in the rock sample and results were compared to ones from phosphor imaging plate autoradiography. The resulting images show a heterogeneous distribution of porosity which arises from the different minerals. The samples were chosen from three sites that have been used recently for in situ diffusion experiments: Olkiluoto (Finland), Äspö (Sweden) and Grimsel (Switzerland).

Keywords

microstructureporositygeologic
Type
Articles
Information
MRS Advances , Volume 3 , Issue 21: Scientific Basis for Nuclear Waste Management XLI , 2018 , pp. 1161 - 1166
Copyright
Copyright © Materials Research Society 2018 

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References

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