Here is a plot of Hathor's (HAT.V) data. x-axis is the scintillator counts per second and the y-axis is the final assay result for % U308.
A good relation is U = 4.1% * (CPS/5000)^2.2
See plot of data here.
"As to Bonaparte, he was well assured that nothing remained for him but to choose between that hazardous enterprise and his certain ruin." -Memoirs of Napoleon Bonaparte, by Bourrienne