RE: Scoring dose angular distributions

From: Burge, F (Frances) <frances.burge_at_diamond.ac.uk>
Date: Tue, 17 Mar 2009 10:16:15 -0000

Looking at the USRYIELD scoring options, if I want to score fluence for
conversion to dose, I think I need to score double differential fluence
yield (d2N/dx1 dx2) * (1/cos theta) rather than d2N/dx1dx2, which would
only give a particle current. But am I correct in thinking that I do
still need to normalise these results to the surface area to obtain the
correct fluence in particles/Gev/sr/cm2 ?
 If this is the case, is it still ok to use the whole target surface
area as the normalisation factor, given that the cos theta term in the
fluence is measured with respect to the normal on each surface ?

thanks,
Frances

________________________________

From: Joachim Vollaire [mailto:joachim.vollaire_at_cern.ch]=20
Sent: 17 March 2009 00:21
To: Burge, F (Frances); fluka-discuss_at_fluka.org
Subject: RE: Scoring dose angular distributions

Hi Frances
To score the integrated (not energy dependent) dose out of the target
against angle relative to the beam axis (which I assume coincid with the
target axis) the second option you suggest using USRYIELD is more
appropriate. Since you are not interested in the energy dependence of
the dose, one single detector should be sufficient.=20
=20
Using USRBDX, as you are pointing out you would have to deal with the
normal of each surface, if you are only interested by the dose out of
the downbeam face for example, you could make a dedicated air region
downbeam using the same plane cutting your ZCC for the target then you
could use USRBDX. But I guess you are interested in particles out the
entire target not only one face...
=20
Hope it helped
Joachim
=20
________________________________

From: owner-fluka-discuss_at_mi.infn.it on behalf of Burge, F (Frances)
Sent: Mon 3/16/2009 11:04 AM
To: fluka-discuss_at_fluka.org
Subject: Scoring dose angular distributions

Dear Fluka users,

  I have a very simple geometry consisting of a beam incident on one end
face of a cylindrical target in air. I would like to score fluence
emerging from the target surface in several angular bins, and then plot
the dose equivalent (obtained from fluence using AUXSCORE) against
angle. I am looking for some advice on choosing the most suitable
scoring option:

>From the course notes for USRBDX, I see that it is possible to score
particles/cm2/GeV/sr per primary, as long as the surface area is given
explicitly. So maybe I can use USRBDX with a single energy bin and
multiple angular bins to score fluence in each angular bin. However, it
also says that angles for USRBDX are measured with respect to the normal
to the surface. With the cylindrical target, the normal will change
direction between the end face and the side of the cylinder, so if I use
this method, do I need separate USRBDX cards for the front, rear and
side surfaces of the cylinder (with surface areas set accordingly) ?

Alternatively, can I use USRYIELD with x1 =3D3D polar angle in lab frame,=

x=3D
2
=3D3D energy (only a single bin required), and setting the normalisation
factor WHAT(6) equal to the surface area of the target cylinder ? This
should also give a result in particles/GeV/sr/cm2 per primary, which I
can convert to particles/cm2/angle, and then use AUXSCORE to convert to
pSv/angle. Since the angles in USRYIELD are measured relative to the
beam direction, will this allow me to deal with scoring in all
directions using a single USRYIELD card ?

Any suggestions on these or other options gratefully received,

Frances

Frances Burge
Health Physicist
01235 778269
Diamond Light Source Ltd.
Harwell Science and Innovation Campus
Didcot
Oxfordshire
OX11 0DE

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<HTML dir=3Dltr><HEAD><TITLE>Scoring dose angular distributions</TITLE>
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<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=3D2><=
SPAN=20
class=3D298235209-17032009></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=3D2><=
SPAN=20
class=3D298235209-17032009>Looking at the USRYIELD scoring options, if I =
want to=20
score fluence for conversion to dose, I&nbsp;think I need to score double=
=20
differential fluence yield (d2N/dx1 dx2) * (1/cos theta) rather than d2N/=
dx1dx2,=20
which would only&nbsp;give a particle&nbsp;current. But am I correct in t=
hinking=20
that I do still need to normalise these results to the surface area to ob=
tain=20
the correct fluence in particles/Gev/sr/cm2&nbsp;?</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=3D2><=
SPAN=20
class=3D298235209-17032009>&nbsp;If this is the case, is it still ok to u=
se the=20
whole target surface area as the normalisation factor, given that the cos=
 theta=20
term in the fluence is measured with respect to the normal on each surfac=
e=20
?</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=3D2><=
SPAN=20
class=3D298235209-17032009></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=3D2><=
SPAN=20
class=3D298235209-17032009>thanks,</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=3D2><=
SPAN=20
class=3D298235209-17032009></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=3D2><=
SPAN=20
class=3D298235209-17032009>Frances</SPAN></FONT></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> Joachim Vollaire=20
[mailto:joachim.vollaire_at_cern.ch] <BR><B>Sent:</B> 17 March 2009=20
00:21<BR><B>To:</B> Burge, F (Frances);=20
fluka-discuss_at_fluka.org<BR><B>Subject:</B> RE: Scoring dose angular=20
distributions<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV id=3DidOWAReplyText30082 dir=3Dltr>
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 size=3D2>Hi Frances</FO=
NT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>To score the integrated (not e=
nergy=20
dependent) dose out of the target against angle relative to the beam axis=
 (which=20
I assume coincid with the target axis)&nbsp;the second option you suggest=
 using=20
USRYIELD is more appropriate. Since you are not interested in the energy=20=

dependence of the dose, one single&nbsp;detector should be sufficient.=20=

</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Using &nbsp;USRBDX, as you are=
 pointing out=20
you would have to deal with the normal of each surface, if you are only=20=

interested by the dose out of the downbeam face for example, you could ma=
ke a=20
dedicated air region downbeam using the same plane cutting your ZCC for t=
he=20
target then you could use USRBDX. But I guess you are interested in parti=
cles=20
out the entire target not only one face...</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Hope it helped</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Joachim</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV dir=3Dltr>
<HR tabIndex=3D-1>
</DIV>
<DIV dir=3Dltr><FONT face=3DTahoma size=3D2><B>From:</B>=20
owner-fluka-discuss_at_mi.infn.it on behalf of Burge, F (Frances)<BR><B>Sent=
:</B>=20
Mon 3/16/2009 11:04 AM<BR><B>To:</B> fluka-discuss_at_fluka.org<BR><B>Subjec=
t:</B>=20
Scoring dose angular distributions<BR></FONT><BR></DIV></DIV>
<DIV>
<P><FONT size=3D2>Dear Fluka users,<BR><BR>&nbsp; I have a very simple ge=
ometry=20
consisting of a beam incident on one end<BR>face of a cylindrical target =
in air.=20
I would like to score fluence<BR>emerging from the target surface in seve=
ral=20
angular bins, and then plot<BR>the dose equivalent (obtained from fluence=
 using=20
AUXSCORE) against<BR>angle. I am looking for some advice on choosing the =
most=20
suitable<BR>scoring option:<BR><BR>&gt;From the course notes for USRBDX, =
I see=20
that it is possible to score<BR>particles/cm2/GeV/sr per primary, as long=
 as the=20
surface area is given<BR>explicitly. So maybe I can use USRBDX with a sin=
gle=20
energy bin and<BR>multiple angular bins to score fluence in each angular =
bin.=20
However, it<BR>also says that angles for USRBDX are measured with respect=
 to the=20
normal<BR>to the surface. With the cylindrical target, the normal will=20=

change<BR>direction between the end face and the side of the cylinder, so=
 if I=20
use<BR>this method, do I need separate USRBDX cards for the front, rear=20=

and<BR>side surfaces of the cylinder (with surface areas set accordingly)=
=20
?<BR><BR>Alternatively, can I use USRYIELD with x1 =3D3D polar angle in l=
ab frame,=20
x=3D<BR>2<BR>=3D3D energy (only a single bin required), and setting the=20=

normalisation<BR>factor WHAT(6) equal to the surface area of the target c=
ylinder=20
? This<BR>should also give a result in particles/GeV/sr/cm2 per primary, =
which=20
I<BR>can convert to particles/cm2/angle, and then use AUXSCORE to convert=
=20
to<BR>pSv/angle. Since the angles in USRYIELD are measured relative to=20=

the<BR>beam direction, will this allow me to deal with scoring in=20
all<BR>directions using a single USRYIELD card ?<BR><BR>Any suggestions o=
n these=20
or other options gratefully received,<BR><BR>Frances<BR><BR>Frances=20
Burge<BR>Health Physicist<BR>01235 778269<BR>Diamond Light Source=20
Ltd.<BR>Harwell Science and Innovation Campus<BR>Didcot<BR>Oxfordshire<BR=
>OX11=20
0DE<BR><BR><BR></FONT></P></DIV><DIV>&nbsp;</DIV><DIV><FONT size=3D"1" co=
lor=3D"gray">This e-mail and any attachments may contain confidential, co=
pyright and or privileged material, and are for the use of the intended a=
ddressee only. If you are not the intended addressee or an authorised rec=
ipient of the addressee please notify us of receipt by returning the e-ma=
il and do not use, copy, retain, distribute or disclose the information i=
n or attached to the e-mail.<br>Any opinions expressed within this e-mail=
 are those of the individual and not necessarily of Diamond Light Source =
Ltd. <br>Diamond Light Source Ltd. cannot guarantee that this e-mail or a=
ny attachments are free from viruses and we cannot accept liability for a=
ny damage which you may sustain as a result of software viruses which may=
 be transmitted in or with the message.<br>Diamond Light Source Limited (=
company no. 4375679). Registered in England and Wales with its registered=
 office at Diamond House, Harwell Science and Innovation Campus, Didcot, =
Oxfordshire, OX11 0DE, United Kingdom<br></FONT></DIV>
<br>=
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