Re: LSC efficiencies

[Joel Baumbaugh <baumbaug@NOSC.MIL>]

All,



Patrick is absolutely correct!!



I got "35%" efficiency on Cr-51..  I am VERY sorry!  I've just quickly 

double-checked everything else and the rest of my figures are correct.



Again, I apologize to everyone for my type-o,



Joel





t 09:55 AM 2/12/2004 -0500, Patrick McDermott wrote:

>Joel,

>Thanks for the info.  For the ten or so that we routinely run, I agree with

>all but one.  The Cr-51.  While we didn't use NIST traceable standards

>(just pipetted from Cr-51 purchased from NEN) and didn't do a full

>quench curve, we generally have found efficiencies of between 20 and

>30%.  Your 80% figure jumped out at me.

>

>Any details about the Cr-51 work would be appreciated.  Perhaps it is

>as simple as we didn't take the quench into account?

>

>I look forward to hearing from you,

>

>Patrick J. McDermott

>University Health Physicist

>Rutgers Environmental Health & Safety

>27 Road 1

>Piscataway, NJ 08854

>(p) 732.445.2550  (f) 732.445.3109

>email: mcdermot@rehs.rutgers.edu