Publicatie Laka-bibliotheek:
Krypton-85. Proceedings of workshop in SCK/CEN Brussels
| Auteur | SCKCEN |
| Datum | december 1999 |
| Classificatie | 6.01.2.13/02 (KRYPTON - KLIMAAT DISCUSSIE) |
| Voorkant | 
|
Uit de publicatie:
85Krypton
Proceedings of a workshop
in SCK^CEN Brussels
October 19,1998
SCK.CEN
Belgian Nuclear Research Centre
Boeretang 200
B - 2400 Mol, Belgium
Mol, December 99
Introduction
SCK»CEN has a long tradition in the foUow up of atmospheric releases of radionuclides from the
nuclear fuel cycle. A measurement capacity was developed for a range of isotope concentrations
together with computer tools for the calculation of dispersion.
In the period of high growth prognosis for nuclear energy and particularly during the development of
reprocessing in Eurochemic, the S C K ' C E N contributed to measurements, dispersion calculations and
the development of control technology for noble gases.
However the séparation at ppm level of krypton foUowed by measurements at a détection level better
than 0.1 Bq/m^ and meso-scale atmospheric dispersion calculations was not part of our activities in the
past.
The envirormiental report of the Flemish Government, MIRA, had investigated in 1998 the releases of
all kinds of radioactivity, affecting the state of the environment. The study has pointed out the
transboundary atmospheric transport of considérable releases of *^Kr in the reprocessing centres of L a
Hague and Sellafield, with a measurable increase of atmospheric background in our country.
SCK«CEN joined the initiative taken by the University of Gent supported by DBIS/SPRI to investigate
the opportunity of using *^Kr measurements for atmospheric tracer studies. This was organised in
collaboration with the University of Brussels (VUB) and the Royal Meteorological Institute
(KMI/IRM) in Ukkel.
At the end of 1998 SCK«CEN had the honour to host in its head office in Brussels an international
workshop on *^Kr studies introduced by Jean-Paul Samain, General-Manager of the Fédéral Agency
for Nuclear Control (FANC/AFCN) and chaired by Gilbert Eggermont (SCK'CEN and VUB).
The very sensitive measurement capacity developed at the University of Gent since 25 years and the
great improvement in atmospheric transport calculation worldwide have shown to open new
perspectives for environmental safeguard measurement.
The European tracer networking allowed to establish trajectories for noble gases, which could be
useful for nuclear accident dispersion studies too.
The *^Kr investigations have meanwhile also allowed to improve émission data of reprocessing centres
and contributed to improve transparency.
Since the publication of ICRP 26 proposing a skin weighting factor of only 1%, the radiological
concern for the skin risk of low doses from ^^Kr was no longer considered as a priority.
The concentrations ih air occurring in the neighbourhood of reprocessing plants can however not been
neglected, being orders of magnitude higher than background values. They can present a problëm
during short periods in spécifie meteorological conditions and should be taken carefully into account in
the révision of authorisations, eyèntually required due to increased bum-üp and shorter cooling times
of the sjpent fuel in fiiture.
The workshop has illustrated that the global dispersion and mixing of Kr in the atmosphère can be
measured very accurately also with mobile sampling. The radiological risk however remains of
marginal importance at longer distances.
Finally the proceedings also intend to contribute to the pröcess stairted within the E C to develop a more
hölistic approach to risk analysis for the protection of the environment and the atmosphère in particular
and to valorise nuclear measurement capacities.
Paul Govaerts
General-Manager SGK«CENDeze publicatie is alleen op papier bij Laka beschikbaar, niet als pdf.
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