RE: radioactive rocks

["Bauman, Rodney L. (84U) " <84u@BECHTELJACOBS.ORG>]

Also - if the shield blocks contain Barite (sometimes commonly referred to

as "Barite Blocks"), the possibility for Ba-133 exists within the walls.



But, this is probably not applicable to the gravel below the floor.  For the

gravel, you should expect the natural uranium and thorium constituents at a

minimum.  As stated below, for concrete exposed to a neutron flux, the first

anthropogenic isotopes detected are usually Europium 152 and 154 (based on

my experiences).  Which brings me to the question - Why is that?  I've never

took the time to research the answer.  Are they a product of activation?

Or, are they a product of natural uranium fission in the concrete?  Someone

please enlighten me.



Rodney Bauman, CHP, RRPT

Project Health Physicist

Bechtel Jacobs Company, LLC

84u@bechteljacobs.org 



> -----Original Message-----

> From:	Steve Frantz [SMTP:sfrantz@YAHOO.COM]

> Sent:	Saturday, December 08, 2001 4:58 PM

> To:	radsafe

> Subject:	Re: radioactive rocks

> 

> Joel,

> 

> My limited experience indicates that europium (152 & 154) is the

> biggest surprise.

> 

> Stephen Frantz

> sfrantz@yahoo.com

> 

> > I am D&Ding activated concrete sheild walls. Part of the floor

> is above the 

> > DCGL and will have to come out.  Under the floor is a gravel

> subfloor.  I 

> > haven't been able to sample the gravel yet (floor is still in

> place).  Has 

> > anyone run into this situation?  What nuclides show up in the

> gravel?  

> > Co-60?

> > 

> > Joel I. Cehn, CHP

> > cehn@aol.com

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