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NATURAL ANALOGUE STUDIES OF RADIONUCLIDE MIGRATION

Objective

IT IS IMPORTANT TO BE ABLE TO VALIDATE AND SUPPORT MODELS OF LONG-TERM PREDICTIONS OF RADIONUCLIDE MIGRATION IN THE GEOSPHERE.THE MAIN AIM OF THIS RESEARCH IS TO EXAMINE NATURAL GEOCHEMICAL DISCONTINUITIES AND GRADIENTS AS ANALOGUES OF RADIONUCLIDE TRANPORT IN SEDIMENTS. THE MECHANISMS OF PROCESSES OF MOBILISATION, ADVECTION, DIFFUSION AND RETARDATION FOR NATURAL DECAY SERIES ELEMENTS AND IODINE AND BROMINE WILL BE ADDRESSED. THIS WILL ENTAIL SOME DEVELOPMENT OF THE TECHNIQUES FOR MEASURING SMALL CONCENTRATIONS AND THE SPECIATIONS OF THESE ELEMENTS IN BOTH THE SOLID AND PORE WATER PHASES. ANALYTICAL DETERMINATIONS BY ALPHA SPECTOMETRY AND NEUTRON ACTIVATION ANALYSIS WILL BE CARRIED OUT BY SURRC (DR A B MACKENZIE) UNDER SUB-CONTRACT. SUPPORT IN MODELLING WILL COME FROM CO-OPERATION WITH ECOLE DES MINE DE PARIS, FONTAINEBLEAU, AND FROM A SUB-CONTRACT WITH WS ATKINS ENGINEERING SCIENCES.

1. PHASE 1986-1987
1.1 SITE INVESTIGATIONS.
1.1.1 COLLECTION OF FRESH LOCH LOMOND SEDIMENTS; ANALYSIS OF I AND BR DEPTH PROFILES; PRELIMINARY MODELLING FOR EFFECTIVE DIFFUSION COEFFICIENTS.
1.1.2 PILOT INVESTIGATION OF I, BR, U AND TH GRADIENTS ACROSS MARL/CLAY BOUNDARIES IN A WELL CHARACTERISED SEDIMENT CORE FROM LUNDIN CASTLE, FIFE, EASTERN SCOTLAND.
1.2 A DESK STUDY OF SURFACE DIFFUSION AS A SOLUTE TRANSPORT PROCESS FOR MAJOR CATIONS THROUGH CLAYS, WITH IMPLICATIONS FOR TRACE RADIONUCLIDE MIGRATION.

2. PHASE 1988-1989
2.1 SITE INVESTIGATIONS WILL BE CONCENTRATED ON MEASURING THE SPECIATION AND MECHANISMS OF DISTRIBUTION OF I, BR,U AND TH IN SEDIMENTS FROM LOCH LOMOND, NEEDLE'S EYE, NEAR DALBEATTIE IN SW SCOTLAND, AND FROM BROUBSTER IN CAITHNESS, N SCOTLAND. (THE INVESTIGATION OF LUNDIN CASTLE SEDIMENTS WAS DROPPED IN FAVOUR OF THE MORE FRUITFUL WORK ON THE NEEDLE'S EYE AND BROUBSTER ANALOGUE SITES.)
2.2 MODELLING OF THE RESULTS AND DATA FROM THE FIELD INVESTIGATIONS FOR MIGRATION THROUGH SEDIMENTS. (THE APPLICATION OF THE SURFACE DIFFUSION DESK STUDY HAS BEEN DROPPED IN FAVOUR OF MODELLING THE NEEDLE'S EYE AND BROUBSTER SITES.)

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Natural Environment Research Council
Address

NG12 5GG Nottingham
United Kingdom