Photon shielding problem

From: lzfneu <lzfneu_at_live.com>
Date: Sat, 23 Apr 2011 09:51:50 +0000

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Dear fluka experts,

     I want to calculate the shielding properties of the materials for
383keV energy photon in vaccum. The thickness of the shielding material
is 5cm. I used the usrbdx card to calculate the one way current of the
incident photons and the one way current of the emergent photons.
    Now i have a question:
    Why the current of the incident photons was zero (region from void
to target in usrbdx card) when the photon energy was 383keV. I used
"new-defaults" to calculate the problem. Where am i wrong?
    I have attatched the input file and any help will be appreciate!
   Thanks in advance!
   Regards,
   Z.F. Lee

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<SPAN class=ecxApple-style-span style="WORD-SPACING: 0px; FONT: medium
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<SPAN class=ecxApple-style-span style="WORD-SPACING: 0px; FONT: medium
Simsun; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px;
WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE:
separate"><FONT face=΢ź size=3>Dear fluka
experts,</FONT></SPAN><SPAN class=ecxApple-style-span
style="WORD-SPACING: 0px; FONT: medium Simsun; TEXT-TRANSFORM: none;
COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal;
LETTER-SPACING: normal; BORDER-COLLAPSE: separate"><BR><BR>
<DIV>
<DIV>
<DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 14px;
PADDING-BOTTOM: 8px; COLOR: rgb(0,0,0); LINE-HEIGHT: 1.7; PADDING-TOP:
8px; FONT-FAMILY: arial,verdana,sans-serif; BACKGROUND-COLOR:
rgb(255,255,255)"><FONT face=΢ź size=3>&nbsp;&nbsp;&nbsp; I want
to calculate the shielding properties of the materials for 383keV energy
photon in vaccum. The thickness of the shielding material is 5cm. I used
the usrbdx card to calculate the&nbsp;one way current of the incident
photons and the one way current of the emergent photons.</FONT></DIV>
<DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 14px;
PADDING-BOTTOM: 8px; COLOR: rgb(0,0,0); LINE-HEIGHT: 1.7; PADDING-TOP:
8px; FONT-FAMILY: arial,verdana,sans-serif; BACKGROUND-COLOR:
rgb(255,255,255)"><FONT face=΢ź size=3>&nbsp;&nbsp; Now i have a
question:</FONT></DIV>
<DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 14px;
PADDING-BOTTOM: 8px; COLOR: rgb(0,0,0); LINE-HEIGHT: 1.7; PADDING-TOP:
8px; FONT-FAMILY: arial,verdana,sans-serif; BACKGROUND-COLOR:
rgb(255,255,255)"><FONT face=΢ź size=3>&nbsp;&nbsp; Why the
current of the incident photons was zero (region from void to target in
usrbdx card) when the photon energy was 383keV. I used "new-defaults" to
calculate the problem. Where am i wrong?</FONT></DIV>
<DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 14px;
PADDING-BOTTOM: 8px; COLOR: rgb(0,0,0); LINE-HEIGHT: 1.7; PADDING-TOP:
8px; FONT-FAMILY: arial,verdana,sans-serif; BACKGROUND-COLOR:
rgb(255,255,255)"><FONT face=΢ź size=3>&nbsp;&nbsp; I have
attatched the input file and any help will be appreciate!</FONT></DIV>
<DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 14px;
PADDING-BOTTOM: 8px; COLOR: rgb(0,0,0); LINE-HEIGHT: 1.7; PADDING-TOP:
8px; FONT-FAMILY: arial,verdana,sans-serif; BACKGROUND-COLOR:
rgb(255,255,255)"><FONT face=΢ź size=3>&nbsp;&nbsp;Thanks in
advance! </FONT></DIV>
<DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 14px;
PADDING-BOTTOM: 8px; COLOR: rgb(0,0,0); LINE-HEIGHT: 1.7; PADDING-TOP:
8px; FONT-FAMILY: arial,verdana,sans-serif; BACKGROUND-COLOR:
rgb(255,255,255)"><FONT face=΢ź size=3>&nbsp; Regards,</FONT></DIV>
<DIV style="PADDING-RIGHT: 10px; PADDING-LEFT: 10px; FONT-SIZE: 14px;
PADDING-BOTTOM: 8px; COLOR: rgb(0,0,0); LINE-HEIGHT: 1.7; PADDING-TOP:
8px; FONT-FAMILY: arial,verdana,sans-serif; BACKGROUND-COLOR:
rgb(255,255,255)"><FONT face=΢ź size=3>&nbsp; Z.F.
Lee</FONT></DIV></DIV></DIV></SPAN> </body>
</html>
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Received on Sat Apr 23 2011 - 13:29:09 CEST

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