Re[2]: Counting Statistics

["Jim Dunlap" <jim.dunlap@guardian.brooks.af.mil>]

     As a substitute for the contaminant suggest you procure and use a 
     Ga-68 (68 min half-life) generator.  "Elute It and Pollute It" using 
     the liquid in a syringe or on a Q-tip, depending on your objective.  
     Within 10 hours, it's gone (for practical purposes), and the Ge-68 
     parent breakthrough has not been shown to be a problem.  Incidentally, 
     it's great for contaminating laboratory surfaces and anti-C's.  If you 
     use it for surfaces you want to decon, be sure to neutralize the GaCl 
     eluate (HCl is used to as the eluant/eluent to elute it) with NaOH 
     (same normality), and add chelating agent (e.g., EDTA or DPTA)   to 
     the solution.  Doing this will allow surfaces to be deconed easily if, 
     after you demonstrate finding the contamination with a survey meter 
     (pancake probe, etc.), you want to determine/demonstrate how effective 
     the decontamination effort (using a gauze pad and water) has been.  
     Even the item you use to decon with can be disposed as normal trash 
     following decay.
     
     If the above is not possible for you to do (the generators are fairly 
     expensive), suggest you use talcum or baby powder and the black light.
     
     I can't tell you where to get black lights, if that is what you need.  
     But I suspect you can find those is scientific equipment catalogs as 
     well as on the Internet.


______________________________ Reply Separator _________________________________
Subject: RE: Counting Statistics
Author:  radsafe@romulus.ehs.uiuc.edu at guardian
Date:    1/15/99 6:07 AM


Excellent question, I  have the same problem.
Along with that question, does anybody know if there is anything new on the
market for checking the spread of contamination in a training environment. I
have borrowed a black light and pixie dust form another station, and when I
went to order one for myself I found the vendor was no longer in business.
Has anybody recently ordered this equipment or is there anything new that is
similar?
David Villicana
Dresden RP Training
815-942-2920-2562
David.S.Villicana@ucm.com 

> -----Original Message-----
> From: Timothy.L.Popp@am.pnu.com [SMTP:Timothy.L.Popp@am.pnu.com]
> Sent: Thursday, January 14, 1999 6:47 PM
> To: Multiple recipients of list
> Subject: Counting Statistics
> 
> 
> Could anyone recommend a good, plain language, reference on counting
> statistics?
> Every time something about counting statistics comes up, I pull several of
> my 
> references off the shelf and end up spending more time trying to figure
> out if 
> they are all defining and calculating the same thing.  LLD, MDA, decision
> level,
> critical level, ... I don't care what terms they use.  I'd just like a
> "Counting
> Statistics for Dummies" book that would be a useful reference to me and,
> at the 
> same time, useful in explaining the concepts to someone unfamiliar with
> the 
> material.
> 
> Tim Popp
> Health Physics Scientist
> Pharmacia & Upjohn
> timothy.l.popp@am.pnu.com
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