[ RadSafe ] Monte Carlo Modeling
JPreisig at aol.com
JPreisig at aol.com
Wed May 26 22:51:19 CDT 2010
This is from: jpreisig at aol.com .
Hope all is well where you live and work. A recent posting
using a computational code for solving a health physics problem,
resorting to Monte Carlo modeling. Hey, to solve Health Physics
try to get an analytical solution with pad and paper. If that fails,
a solution using a computational code. If this doesnt work, then
to Monte Carlo modeling, if you can. Not all workplaces allow Health
the time and/or facilities to do Monte Carlo modeling.
These days, one can get significant computing memory <3 Gigabyte
memory and 300 Gigabytes storage memory???> for one or 2 thousand
dollars or less. A Fortran compiler <Compaq/Intel>, for those of us
not making the leap to other programming languages, can be had for
something like 1000 dollars or so. Such a compiler can include the
<International Mathematical Statistical Library> software library,
very handy to have. MCNP <Monte Carlo Neutral Particle> program can
gotten from RSICC <Radiation Shielding Information Center> at Oak Ridge
or possibly from Los Alamos. This computer code can be used to model
neutron and/or x-ray/gamma problems. EGS <Electron Gamma Shower>
can be tracked down on the web and ordered for use in electron
problems. CASIM, MARS, LAHET, FLUKA, MCNPX, etc. can be ordered
from RSICC or other sources.
Such Monte Carlo codes have a non-trivial learning curve, and
it takes a
while to set up problem geometries and to do other things. Not all
workplaces can afford such a devotion of time and/or financial
Still, I think many problems can be set up computationally in a day or
And with today's computers, many problems can be run in under a day or
less. Do what you will --- I don't make money on sale of these
For neutron data unfolding, look at the computer codes:
LOUHI, MAXED, BUNKI, etc. See Patterson and Thomas's book
Accelerator Health Physics <if you can find a copy> for solution
See also Cossairt's Course notes on Accelerator Health Physics.
One can use the repeated structure capability of MCNP to
model nuclear reactor design problems.
As for small nuclear reactors soon??? to be available to provide
power for small towns etc., how cool is that. The NRC will probably
to hire more NRC inspectors, if the sale of such reactors takes off.
I doubt the NRC paperwork for such a reactor will be too complex,
such a reactor is simpler than a power reactor <PWR/BWR>. We'll see.
A local cable TV program keeps suggesting that the power utility
runs the nuclear reactors in South New Jersey will be looking to
construct one more new reactor in South Jersey <not Oyster Creek>.
Again, we'll see what happens.
Too bad Fermi never had a copy of MCNP to run. I heard a story
he used to do Monte Carlo calculations in his head at night, because
had trouble sleeping. Too much expresso????!!!!
The matter/antimatter mass difference in nature is being explained
via the difference in muon versus anti-muon decay rates <see Fermilab,
Brookhaven, CERN, etc. websites>.
You all have a good week!!!!!
Regards, Joseph R. <Joe> Preisig, Ph.D.
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