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ACCOUNTING METHOD FOR RADIATION DOSES DUE TO LONG LIVED NATURAL RADIONUCLIDES AND DAUGTHERS

Objective

THIS STUDY IS AIMED AT DEVELOPING A METHOD TO EVALUATE RADIATION DOSES OCCURING IN THE VERY FAR FUTURE FROM POSSIBLE CURRENT FUEL AND WASTE MANAGEMENT PRACTICES. THIS METHOD IS TO BE APPLIED TO FACILITATE DECISIONS ON DIFFERENT MANAGEMENT SCHEMES.
FOR THE DISTANT FUTURE IT IS JUSTIFIED TO ASSUME THAT THE RADIOACTIVE WASTE WILL HAVE BEEN MOBILISED AND WILL HAVE FOUND MANY PATHWAYS TO MANKIND. BUT ONLY THE MOST LONG-LIVED RADIONUCLIDES CAN CONTRIBUTE TO THESE PATHWAYS. THIS EXCLUDES MOST OF THE FISSION PRODUCTS WITH THEIR SHORTER HALF-LIVES. THE REMAINING LONG-LIVED ONES, HOWEVER, ARE FAR LESS IN NUMBER THAT THE NATURAL RADIONUCLIDES WHICH HAVE BEEN DISCARDED EARLIER IN THE COURSE OF THE FUEL CYCLE. HENCE FOR THE FAR FUTURE THE LATER SHOULD ALSO BE TAKEN INTO ACCOUNT WHEN ASSESSING THE FUTURE DOSES.

SINCE NO ABSOLUTE SCALES EXIST FOR THE EFFECTS OF RADIOACTIVITY TO MAN ONE ALWAYS HAS TO RESORT TO A COMPARISON WITH SOME NATURAL SOURCE OF RADIOACTIVITY. IN THE PRESENT CASE THE MOST RELATED SOURCE WOULD BE THE NATURAL LONG-LIVED RADIONUCLIDES IN THEIR ORIGINAL AND UNDISTURBED ENVIRONMENT AND THEIR NATURAL MOBILISATION BY EROSION AND GROUND OR SURFACE WATERS.
BOTH THE MOBILISATION OF WASTE AS WELL AS THAT OF NATURAL RADIONUCLIDES WILL RESULT IN A MULTITUDE OF DIFFERENT PATHWAYS TO MAN WHICH ALL HAVE TO BE CONSIDERED IF DUE ACCOUNT OF ALL INFLUENCES IS REQUIRED. HENCE, THIS TASK CANNOT BE SOLVED WITH INDIVIDUAL DOSES AND HENCE ON HAS TO TURN TO COLLECTIVE ONES.

1.- ASSESSMENT OF NATURAL SCENARIOS: ABUNDANCE OF NATURAL RADIONUCLIDES, MECHANISMS OF DEPOSITION, MECHANISMS OF MOBILISATION, PATHWAYS TO POPULATION AND COLLECTIVE DOSES, FUTURE DEVELOPMENT, VALIDATION.

2.- ASSESSMENT FOR USE OF NATURAL RADIONUCLIDES: TOTAL NEEDS, PRODUCED WASTE, FUEL CYCLE SCENARIOS, FAILURE OF REPOSITORIES, HAZARDS TO POPULATION.

3.- GLOBAL COMPARISON. OF NATURAL AND USED URANIUM: COLLECTIVE DOSE COMPARISON.

4. TIME DISPLAY OF ANNUAL COLLECTIVE DOSES AND COMPARISON.

Funding Scheme

CSC - Cost-sharing contracts
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Coordinator

Dornier Luftfahrt GmbH
Address
An Der Bundesstraße 31
88039 Friedrichshafen
Germany