Inteference correction for different energy Beta

[Mr Jo <mjo@scs.unr.edu>]

I am trying to generate a beta efficiency curves vs beta energy for commonly
used survey meters with pan cake GM and thin end window GM. We purchased a
calibrated beta standard which includes Pb-210 and Sr-90. Pb-210 has 61 keV
beta, 10.8 keV x-ray, and 46.5 keV gamma. My problem is how to estimate
Pb-210's contribution to the Bi-210 betas when the above detectors are used. A
similar problem exist to Sr-90 (546 keV)/Y-90 (2283 keV) beta source. I would
like to use Y-90 as high end energy point in my graph but I am not sure how to
separate between two betas. I feel like contribution from both Sr/Y-90 would
be close to 1:1 (50% contribution each) when detector is in contact with
source. I don't feel using 1:1 ratio would be a correct way.

If someone had worked out this problem, I would appreciate to know.

========================================================
Myung Chul Jo, RSO
EH&S, Mail Stop 328
University of Nevada, Reno
Reno, Nevada 89557
(702)784-4540
(702)784-4553 fax


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