EISERBUD: of the large nunber of samples involved could be re in terms of sore absolute methods which other pecple used for exerple LIBBY: 8 ‘Yea, I think there is a good possibility of that. You TE keep good notebooks, then you can always go back ani, by stanierdising, this would be very helpful if you could fairly soon, it isn't a vory dig jod, anid write down as function of energy what your counting efficiency would then convert back to betacuries per square mile as a re of this, ee That would give us « mber which might differ eppreciably and might be mre valuable. ~ aa Dorarteanh3 ef{oie ancy a = as ond é 4s z.