RE: Two Questions

["Bradshaw, Keith" <Keith.Bradshaw@nnc.co.uk>]

> -----Original Message-----
> From:	Mercado, Don [SMTP:don.mercado@lmco.com]
> Sent:	Friday, April 07, 2000 8:38 PM
> To:	Multiple recipients of list
> Subject:	Two Questions
> 
> Holy smokes. How about some health physics for a change.
> 
> #1.
> 
> I'm currently reviewing the calibration program for our proportional
> counters. The plateaus are beautiful. We use Sr/Y-90 and C-14 to calculate
> efficiencies. What would you expect the counting efficiencies to be?
> 
	With 10mg strontium and 0.5mg yttrium as nitrates on stainless steel
planchettes, I got 0.71 cps per Bq Sr-90 (Y-90 in equilibrium). This
efficiency calibration came up with pretty good results on NPL
intercomparison.  Don't know about C-14, but I think the claims of the
manufacturer are a bit optomistic. Also it's going to be highly variable
with sample mass and geometry.
> #2
> 
> What long-lived transuranics are produced by fission and fusion weapons?
> 
	Einsteinium z=100 was first discovered in hydrogen bomb debris.



	Personal thoughts only


	keith.bradshaw@nnc.co.uk






	END









	END


**********************************************************************
NNC Limited
Booths Hall
Chelford Road
Knutsford
Cheshire
WA16 8QZ

Country of Registration: United Kingdom
Registered Number: 1120437

This email and any files transmitted with it are confidential and 
intended solely for the use of the individual or entity to whom they   
are addressed. If you have received this email in error please notify 
the NNC system manager.
**********************************************************************
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html