RE: Sr-90 Source Activity/Geometry -Reply

["JOHN L. MCCARTHY" <MCCARJL@GWSMTP.NU.COM>]

Sumimasen, but I think the total activity might be underestimated by 1/2 using
this approach.

Assume calibration yields an instrument response of 200 cps.  The calibration
factor using only the Sr-90 activity (802 Bq) becomes 4.01 Bq/cps or 0.249
cps/Bq.

Does this mean you would report a sample's total activity (with Sr-90 and Y-90
in equilibrium) as 8020 Bq for an instrument response of 2000 cps? Some
Regulators might disagree.

Jack McCarthy
mccarjl@gwsmtp.nu.com
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