RE: Re: Radiation Shielding Windows

["Neil, David M" <neildm@id.doe.gov>]

You prompted me to get out my copy of Cember and check, and it was about
the way I recalled it; the intermediate calculation  usually ended up as
HVL, and was converted from there.  It would be just as valid to perform
the calculation the other way around, but that's how I learned it.

And come to think of it he may have been familiar with the concept and
not the name; for most of my field career, the phrase used was 'tenth
thicknesses' not 'tenth (or half) value layer'.  And that was the basis
of field calculations for temporary shielding - the shielding blankets
used were, as I recall, approximately equal to a tenth thickness for the
MeV most commonly found in that environment.

So I guess it's a matter of what you're used to.

Dave Neil
neildm@id.doe.gov

> -----Original Message-----
> From:	L_K_II_Les_Aldrich@RL.gov [SMTP:L_K_II_Les_Aldrich@RL.gov]
> Sent:	Wednesday, July 08, 1998 10:28 AM
> To:	Multiple recipients of list
> Subject:	RE: Re: Radiation Shielding Windows
> 
> Dave, Ernie, Sandy, et.al.
> 
> Maybe something has happened in the years since I last was involved in
> designing shielding.  However, searching my memory, I don't remember
> any
> shielding computer code that had an input parameter of "HVL" ( or, for
> that matter, "TVL").  As I recall, you start with a source term and
> the
> maximum dose you want at some other point, and determine how thick a
> given shielding material or combination of materials must be to
> achieve
> the dose reduction.  Maybe on the back of an envelope you use HVL or
> TVL
> to assure yourself that the computer code is working properly, but it
> was never, in my experience, part of the actual shielding design
> calculation.
> 
> For those of us who "know a lot of stuff", our primary responsibility,
> as I see it, is mentoring those who don't know what we know.  I would
> hope that in the future, when someone says, "I don't know what this
> means.", the first response on RADSAFE says, "This is what it means."
> 
> Just my personal perspective, of course.
> 
> Les Aldrich
> l_k_ii_les_aldrich@rl.gov
> 
> > -----Original Message-----
> > From:	Neil, David M [SMTP:neildm@id.doe.gov]
> > Sent:	Tuesday, July 07, 1998 2:26 AM
> > To:	Multiple recipients of list
> > Subject:	RE: Re: Radiation Shielding Windows
> > 
> > Ernie --- HVL is integral to the product he represents.  About
> > analogous
> > to a car salesman not knowing what MPG stands for.
> > 
> > But, Sandy, you *were* a bit forceful toward him. Radsafe is one of
> > the
> > more heavily trafficked lists I've seen.
> > 
> > Dave Neil
> > neildm@id.doe.gov
> > 
> > > -----Original Message-----
> > > From:	Egoitein@aol.com [SMTP:Egoitein@aol.com]
> > > Sent:	Saturday, July 04, 1998 8:48 PM
> > > To:	Multiple recipients of list
> > > Subject:	Re:  Re: Radiation Shielding Windows
> > > 
> > > With all due respect Sandy, 
> > > 
> > > why put people down just because they don't know your techno
> babble.
> > > You
> > > must have had a bad day .  In Peace
> > > 
> > > Ernie Goitein
> > > egoitein@aol.com