Re: Radioisotope Efficiencies

[Joel Baumbaugh <baumbaug@NOSC.MIL>]

Jim is correct in his question.



As I thought I briefly mentioned in my original email/post, these were MY 

efficiencies under somewhat ideal conditions.



The type (size and composition) of vial, the manufacture/type and amount of 

scintillation fluid (in the vial(s)), counting times, color/chemical 

quenching, background and how you deal with background 

(refrigeration/background subtract), how long its been since your PM 

service (you don't want any dust on the PMT tube faces), what your counting 

windows are set at/for, what formula you use for MDA/LLD, etc., etc., etc. 

ALL these parameters (and some I haven't thought of while writing this) 

make a difference on what efficiency YOU and YOU're machine will get/arrive 

at with the various/sundry radioisotopes I listed.



Just like they say in the advertisements... "your results may vary"....  I 

was just giving you an example of what YOU should expect on YOUR machine if 

everything (your prep and the machine) are in top working order.



Please don't nail me to a cross here - I was just trying to be 

helpful.  There are people on RADSAFE who are MUCH more knowledgeable about 

LSC's than I am.



I don't think that you'll be able to find this information in the 

literature (either in a library or on-line) anywhere else..  Take it (and 

use it as a benchmark/reference) or leave it...





...Joel Baumbaugh (baumbaug@nosc.mil)

     SSC-SD...





At 09:53 AM 2/18/2004 -0500, JDNUKE52@aol.com wrote:

>I have one question what was the LCS window settings and what liquid scint 

>cocktail use this is very important when establishing LCS efficiencies.

>

>

> 

>Thankyou

>

> 

>Jim Dykes  COH

>