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RE: Y-90
As an aside to the topic of the gamma that is or isn't associated with Y-90
as part of the RCT continuing training program at Hanford we actually
measured the distance that a Y-90 travels in air. This was in the spring of
1997 if memory serves me. From a 1.5 mCi Sr/Y-90 check source, using a
pancake GM probe w/scaler. Using the Critical Level calculation. We were
able to show that you could detect beta above Lc at distances of 18 - 20
feet depending upon the density of the air that day. It was an eye opener
for the technicians as they were required to calculate the travel distance
based on Emax then SWAG for the true distance. The vast majority were
several feet short of the actual travel distance. So for a regulator to say
you don't need to worry about beta shielding means that regulator should do
some soul searching.
Chris A. Marthaller, RRPT
Sr. Training Coordinator, WIPP
(505) 234-8661
Chris.Marthaller@wipp.ws
I alone am to blame for my statements.
"If we keep doing what we are doing, we will keep getting what we are
getting." ANON
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