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Publicatie Laka-bibliotheek:
The geochemistry of radionuclides with long half-lives. Their expected migration behaviour (1980)

Auteur	B.Skytte Jensen
Datum	april 1980
Classificatie	6.01.2.10/38 (TECHNISCH - ALGEMEEN)
Voorkant

Introduction

The high-level radioactive waste contains several radionuclides whose lifetimes 
vastly exceed the time spans mankind has had experience in handling.

It is obvious that no one can secure that geological or manmade structures remain 
undisturbed for several hundred thousand years or more. On can therefore not 
ascertain that some of the activity in geological disposed waste will not be 
released from the repository in some distant future.

It is generally agreed that the only medium for transportation of eventually released 
activity to the biosphere is groundwater. It is therefore important to be able to 
predict the behaviour of the long-lived radionuclides under the conditions in 
groundwaters which may be found in diverse geological formations now and 
in the future.

Although 90sr is the potentially most dangerous activity in the waste, its rather 
short half-life (29 years) secures that reasonable delays in its release will reduce 
its possible impact on the surroundings to a negligible magnitude.

The long-lived radionuclides in the waste, which are formed in larger amounts, are 
found among the transuranium elements, i.e. 239Pu, 237Np, 241Am etc. In addition 
the long-lived fission product 99Tc need also be considered because it is one of 
the major components of the waste.

Most of the chemistry of these compounds has been studied under conditions which 
deviate appreciably from those encountered in nature, but at present new information 
is published which supports predictions based on theoretical considerations.

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