128 Ag I said before, we have used this quite extensively in the laboratory to obtain an isotope of zirconium say, for Placing in a solution that we wanted to run first as development work zirconium lonium and we have to determine whether the solution is pure and then of course, in the case of two samples, to see if the isotopes precipitator is best for what procedure has been worked out for them, Other applications that we have found to apply are such things as equilibrium state of urnnium and thorium waterg by having a set of standards to pitch blend and uranium oxide we can plot these against an unknown sample of uranium bearing ore and determine the state of equilibrium that it is in, The last topic I would like to mention is the elucidation of some of the decay ~- in running a tremendous number of these absorption ourves and checking with standard N.B.8. data, we have discovered a few discrepancies and one 1a a fairly well studied isotope cesium barium 137, and mush work has been done on this Lsotope spectroscopically, but none has been done absorption= wise. —