Re: problem with USRYIELD

From: Sunil C <>
Date: Thu, 6 Jan 2011 21:52:25 +0530

Perhaps you should try the LAM-BIAS card also along with photonuc card.
There is an example in the manual.

The USRYIELD card scores the yield in unit solid angle(sr-1) at the given
direction. The half solid angle is defined by the upper and lower angle that
are input as what(4) and what(5) in the second card. See the answer
by Giuseppe.

The steradian can be converted to unit area at a distance (solid angle =
dA*cos(theta)/r2), theta=0 if normal to surface. ONce you convert the sr to
cm-2, you can use the ICRP or Maurizio Pelliccioni's fluence to dose
conversion coefficients given in units of pSvcm2 and obtain dose equvalent.

Good luck!


On Mon, Jan 3, 2011 at 1:16 PM, Hamideh Jalali <> wrote:

> Dear FLUKA users
> In my problem a 3GeV electron beam strike a target of iron and I'm
> going to score gamma and neutron dose equivalent in angles 0 and 90
> degree with respect to beam direction around the wall of concrete. So
> I used USRYIELD for this aim but in 0 degree, the results are one or
> two order less than what I expected and in 90 degree, the results are
> zero. Please guide me where I am wrong?
> The other question, as I've got I can set angles in USRYIELD in radian
> or degree but the results are in sr and if I normalize results to
> surface area I will obtain dose equivalent in pSv/ Now
> I want to find dose equivalent in pSv/primary, is it correct if I
> multiply cumulative spectrum by angular interval width in radian?
> the input file is attached.
> Best Regards
> Hamideh
Received on Thu Jan 06 2011 - 19:18:02 CET

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