translate English to French: The estimates of total deposition and fractional deposition discussed above of course rely upon the accuracy of the underlying I-131 deposition densities calculated by interpolating a relatively small number of gummed film measurements and weighting interpolated values by measured precipitation (NCI, 1997).
However, the yield for this event is presumed to have been mostly fusion, although the fractional fission yield is not available; the fact that the fission yield is unavailable is a major contributor to the uncertainty in the calculated deposition values for Project Sedan.