problem with neutron shielding with borated polyethylene

From: Alberto Fasso' <fasso_at_SLAC.Stanford.EDU>
Date: Mon, 16 Jan 2012 08:48:15 -0800 (PST)

Dear En-Min,

I don't think there is anything wrong in your input file, except that
5.E-7 is not 0.5 eV, as you believe, but 0.5 keV.
If you want to do a test at 0.5 eV, you should have 5.E-10 in the
WHAT(1) of the BEAM command.

I am not sure that this correction will give you the result that you expect,
but you can try.

Best regards,


> Dear Alberto,
> Thanks for your help.
> Actually in my original design I let the beam hit lead, and with the
> borated polyethylene surrounding the lead, but the 5% one and 30% one
> make little difference. The plots is appended.
> I tried to directly inject slow neutron (0.5eV) on the borated
> polyethylene, but the 5% one and 30% one again make little difference.
> I really doubt I make something wrong in my input file, but I can't
> find where is wrong. Would you please help me find out where's wrong?
> Thanks again,
> En-Min
Received on Thu Jan 19 2012 - 18:55:57 CET

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