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Hi Sophie,<br>
<br>
Did you try to check the energy conservation with particles totally
absorbed in the water tank (e.g. 5 keV electrons) ?<br>
<br>
Yann<br>
<br>
<div class="moz-cite-prefix">Le 22/05/2013 12:19, Chiavassa Sophie a
écrit :<br>
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<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I performed two simple
simulations (see main.mac):<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Spherical
monoenergetic source of photons (50 keV) in a water tank
(20x20x20 cm)
<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Dose
actor Volume attached to the water tank and a resolution of
100 100 100 (voxel size = 2x2x2 mm3)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Same
physic.mac (see physics.mac) and same number of particles
<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0
level3 lfo1">
<!--[if !supportLists]--><span style="font-family:Wingdings"
lang="EN-US"><span style="mso-list:Ignore">§<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Simulation1
= mathematical water tank (box)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l0
level3 lfo1">
<!--[if !supportLists]--><span style="font-family:Wingdings"
lang="EN-US"><span style="mso-list:Ignore">§<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Simulation
2 = voxelized water tank (image analyse)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Relative results are
identical (relative-comparison.jpg) but absolute results
present significant discrepancies (absolute-comparison.jpg),
although the number of initial particles is the same for the
two simulations.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Someone could explain
that ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">Sophie
Chiavassa<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">Radiophysicienne</span></b><b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">Service
de physique médicale<o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span
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Gauducheau<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:FR">Site
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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