From: Sunil C <csunil11_at_gmail.com>

Date: Tue, 11 Jan 2011 14:56:21 +0530

Date: Tue, 11 Jan 2011 14:56:21 +0530

Hi

It is a bit sketchy how you got the surface area from sr-1.

The units of usryield is given as GeV-1sr-1primary-1. (Don't confuse this

with the boundary crossing USRBDX estimator, which has a cm-2 also in its

unit.) Thus to get a cm-2 into your unit, you have to use the relation

mentioned before. Once you do this, you have area in your units and no solid

angle (cm-2 GeV-1 primary-1) but now at a distance (which is 'r'). Multiply

the results by the bin width (GeV) and you have cm-2 primary-1. The USRYIELD

results are now ready to be multiplied with the conversion coefficients

(pSvcm2).

The final result will be in pSv primary-1 at distance 'r'.

Hope it helps.

Sunil

On Thu, Jan 6, 2011 at 9:52 PM, Sunil C <csunil11_at_gmail.com> wrote:

*> Hi
*

*> 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.
*

*> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0439.html
*

*>
*

*> 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!
*

*>
*

*> Sunil
*

*>
*

*>
*

*> On Mon, Jan 3, 2011 at 1:16 PM, Hamideh Jalali <jalali.hb_at_gmail.com>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/GeV.sr/primary. 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
*

*>>
*

*>
*

*>
*

--0016e65b52e471eeb804998ead6e

Content-Type: text/html; charset=ISO-8859-1

Content-Transfer-Encoding: quoted-printable

Hi<br>It is a bit sketchy how you got the surface area from sr-1. <br><br>T=

he units of usryield is given as GeV-1sr-1primary-1. (Don't confuse thi=

s with the boundary crossing USRBDX estimator, which has a cm-2 also in its=

unit.) Thus to get a cm-2 into your unit, you have to use the relation

men=

tioned before. Once you do this, you have area in your units and no solid a=

ngle (cm-2 GeV-1 primary-1) but now at a distance (which is 'r'). M=

ultiply the results by the bin width (GeV) and you have cm-2 primary-1. The=

USRYIELD results are now ready to be multiplied with the conversion

coeffi=

cients (pSvcm2).<br>

<br>The final result will be in pSv primary-1 at distance 'r'.<br><=

br>Hope it helps.<br><br>Sunil<br><br><br><div class=3D"gmail_quote">On Thu=

, Jan 6, 2011 at 9:52 PM, Sunil C <span dir=3D"ltr"><<a href=3D"mailto:c=

sunil11_at_gmail.com">csunil11_at_gmail.com</a>></span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=

r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div>Hi</div>Perh=

aps you should try the LAM-BIAS card also along with photonuc card. There i=

s an example in the manual.<div>

<br>The USRYIELD card scores the yield in unit solid angle(sr-1) at the giv=

en 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. =A0See the answer=

by=A0Giuseppe.=A0</div>

<div><a href=3D"http://www.fluka.org/web_archive/earchive/new-fluka-discuss=

/0439.html" target=3D"_blank">http://www.fluka.org/web_archive/earchive/new=

-fluka-discuss/0439.html</a></div><div><br></div><div>The steradian can be =

converted to unit area at a distance (solid angle =3D dA*cos(theta)/r2), th=

eta=3D0 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=A0coeffic=

ients=A0given in units of pSvcm2 and obtain dose equvalent.</div>

<div><br></div><div>Good luck!</div><div><br></div><font color=3D"#888888">=

<div>Sunil</div></font><div><div></div><div class=3D"h5"><div><br></div><di=

v><br></div><div><div class=3D"gmail_quote">On Mon, Jan 3, 2011 at 1:16 PM,=

Hamideh Jalali <span dir=3D"ltr"><<a

href=3D"mailto:jalali.hb_at_gmail.com=

" target=3D"_blank">jalali.hb_at_gmail.com</a>></span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=

r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Dear FLUKA users<=

br>

<br>

In my problem a 3GeV electron beam strike a target of iron and I'm<br>

going to score gamma and neutron dose equivalent in angles 0 and 90<br>

degree with respect to beam direction around the wall of concrete. So<br>

I used USRYIELD for this aim but in 0 degree, the results are one or<br>

two order less than what I expected and =A0in 90 degree, the results are<br=

*>
*

zero. Please guide me where I am wrong?<br>

The other question, as I've got I can set angles in USRYIELD in radian<=

br>

or degree but the results are in sr and if I normalize results to<br>

surface area I will obtain dose equivalent in pSv/GeV.sr/primary. Now<br>

I want to find dose equivalent in pSv/primary, is it correct if I<br>

multiply cumulative spectrum by angular interval width in radian?<br>

the input file is attached.<br>

<br>

Best Regards<br>

<font color=3D"#888888">Hamideh<br>

</font></blockquote></div><br></div>

</div></div></blockquote></div><br>

--0016e65b52e471eeb804998ead6e--

Received on Wed Jan 12 2011 - 00:38:17 CET

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