UO2- High Energy "Gamma Spectrum Analysis" (no exciter, looking at natural radioactivity of U-238 and now U-235 decay).
Based upon the U-235 being either of natural abundance or depleted to some extent.
Most of the atoms in the sample are U-238 and those won't??"grow" the lower daughters into secular equilibrium for a long, long time. due to the "stopper" of U-234's long half-life.
