[ RadSafe ] formula and its derivation for rectangular extendedradioa...

[JPreisig at aol.com]

Mike Brennan/Radsafe:
 
      That's an interesting idea.
 
      MCNP modeling shouldn't take a week, if one  already has MCNP on a 
PC.  And PC's these days are
so very powerful.  Problem setup for a rectangular source should take  
about one day, and a first MCNP
run should take 4 to 8 hours or less.  Perhaps then, one can directly  
compare these Monte Carlo results with your measurements.
 
     In the olden days, I sure would like to have come  up with an analytic 
and/or numerical solution.  Solving problems this way  forces one to 
seriously understand the problem.  The book on Mathematical  Physics by Arfken 
might be real helpful for getting an analytical or numerical  solution.  The 
book Numerical Recipes by
Press, Teukolsky et al. has many different numerical solution algorithms,  
complete with Fortran or C
computer code.
 
    Pick a solution method or two and get cranking.   You can't use MCNP on 
the CHP exam!!!!
 
    Joe Preisig
 
 
 
 
In a message dated 7/12/2013 5:05:48 P.M. Eastern Daylight Time,  
Mike.Brennan at DOH.WA.GOV writes:

I know  this is rather old school, but if the source really exists, and
there are  actually people who do things near it, how about a
"tag-and-release"  dosimetry program?  Sometimes a day of measurement can
replace a week  of modeling.

-----Original Message-----
From:  radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu]  On Behalf Of dcoble tds.net
Sent: Friday, July 12, 2013 12:15 PM
To: The  International Radiation Protection (Health Physics) Mailing List
Subject:  Re: [ RadSafe ] formula and its derivation for  rectangular
extendedradioa...

Micro shield tm  works  also.

On Friday, July 12, 2013,  <JPreisig at aol.com>  wrote:
> Radsafe:
>
>       I know this  is overkill or too expensive or  time consuming for 
> some  people/facilities, but one could readily set up a  rectangular 
>  radiation source using MCNP (Monte Carlo Neutral Particle Program)   
> and do a Monte
Carlo
> Run (or a few) and solve the  problem.  Do some of the  simpler 
> computer radiation codes  model a rectangular source????
>
>       Regards,   Joe Preisig
>
>
>
>
> In a  message dated 7/12/2013 2:36:29 P.M. Eastern Daylight Time, 
>  daniel.s.simpson at nasa.gov writes:
>
>  George:
>
>
>
> I don't see a WORD file   attached.
>
>
> Daniel S. Simpson
> Deputy Chief, Code  350 Occupational  Safety & Health Division National

>  Aeronautics and Space  Administration Goddard Space Flight Center
>  Greenbelt, MD   20771
> (301) 286-2281
> Fax: (301)  286-1745
>
>
>
> -----Original   Message-----
> From: radsafe-bounces at health.phys.iit.edu
>  [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of George   
> Chabot
> Sent: Friday, July 12, 2013 2:22 PM
> To: 'The  International  Radiation Protection (Health  Physics)
MailingList'
> Subject: Re: [ RadSafe ]  formula and  its derivation for rectangular 
> extended radioactive sources   exposure rate
>
>
>
> Regarding the rectangular  source, attached is a  Word document showing

> the equation  development. It is not possible to obtain a  complete 
> algebraic  solution to the required integration, but the resulting  
>  equation is
easily
> solved using numerical  integration.
>
>
>
> George   Chabot
>
>
>
> -----Original  Message-----
>
> From:
>  radsafe-bounces at health.phys.iit.edu<mailto:
radsafe-bounces at health.phys.iit.edu>
>
>  [mailto:radsafe-bounces at health.phys.iit.edu]  On Behalf Of Danak,  
> Subhash
M
> CTR DOD CAPMED FBCH
>
> Sent:  Thursday, July  11, 2013 10:28 AM
>
> To:   radsafe at health.phys.iit.edu<mailto:radsafe at health.phys.iit.edu>
>
>  Subject:  [ RadSafe ] formula and its derivation for rectangular 
>  extended radioactive  sources exposure  rate
>
>
>
> I like to review formula for  rectangular  radioactive sources exposure
rate.
>
> Please  provide one.
>
> I thank   you.
>
>
>
>  Subhash
>
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