[ RadSafe ] Spent nuclear fuel: Graph of gamma vs. time for the first 1000 yrs

Bernard Cohen blc+ at pitt.edu
Wed Nov 9 09:37:43 CST 2005

All of this info and much, much more is in:

Croff AG and Alexander CW. Decay characteristics of once through LWR and 
LMFBR spent fuels, high level wastes, and structural material wastes. 
Oak Ridge National Laboratory Report ORNL/TM-7431;1980

      A plot of what you ask for is in Fig. 8 of my paper "High level 
waste from light water reactors, Reviews of Modern
Physics  49: 1-20;1977. Cs-137 is dominant, but others are Cs-134, 
Rh-106, Pr-144, and Co-60.

Bjorn Cedervall wrote:

> Dear Radsafers,
> I wonder if anyone could point at a graph showing the total of the 
> most important gamma and beta (90Sr essentially I believe.) in spent 
> nuclear fuel. This is not about the risks as described by dilution in 
> water.
> The example could come from some typical BWR or PWR plant.
> Which gamma emitting radionuclides must be considered besides cesium 
> 137 say in the time interval 40 yrs (taken as time for long term 
> storage) to 1000 yrs?
> Are there any other dominating beta emitting radionuclides besides Sr 90.
> If there are just a few dominating gamma radionuclides, please then 
> give them in their approximate relative proportions from time "zero" 
> or after say 40 yrs.
> Any help will be much appreciated.
> Best regards,
> Bjorn Cedervall         bcradsafers at hotmail.com
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