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Publicatie Laka-bibliotheek:
Simulation of the build-up of radiation damage in NaCl (1994)

Auteur	ECN, Soppe, Prij
Datum	juli 1994
Classificatie	6.01.5.51/39 (AFVAL - OPSLAG OP LAND (oa ZOUT/KLEI))
Voorkant

Abstract

In many countries geological rock salt formations are considered as possible hosts
for high-level radioactive waste (HLW) repositories. One of the aspects which need a
very careful examination before such a repository can be taken into operation is the
problem of radiation damage in salt. It is generally known that irradiation of alkali
halides can lead to a degradation of the crystal lattice through the formation of point
defects (F and H centers). Further, it is known from experiments that, under certain
circumstances with respect to temperature and dose, these point defects can aggregate
and form alkali metal colloids and molecular halogen gas bubbles. In order to estimate
the radiation damage that can be produced in a rock salt repository, a simulation
model has been developed by which the concentrations of point defects and their
aggregates can be calculated as a function of all relevant parameters (1). This model
is based on macroscopic rate reactions and is in fact an extended version of a model
derived by Jain and Lidiard (2). An important element in the new model is the
implementation of the colloid nucleation stage, In this paper, we present model
calculations of early-stage colloid formation in NaCI crystals, heated after being
irradiated at a low temperature, The model calculations are compared with
experimental results obtained by Inabe and coworkers (3).

keywords: radiation damage, NaCI, colloids, nucleation, simulation, optical
absorption.

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