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<p class="MsoPlainText"><span lang="EN-US">Hi Michael, hi everybody<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">very nice, congratulations!<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Regarding the resolution assessment, may I suggest you also try Fourier Ring Correlation (FRC) for resolution assessment. It has got the advantage that it does not require a test pattern, one just needs to have 2 corresponding
images of the given object, so here you can use 2 x 7 projections from the original stock.
<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">FRC has been created for the cases of imaging modalities for which the provision of perfect imaging test objects/patterns is difficult (such as for TEM), which seems to be the case here as well.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText">With best regards<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Pavel<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">__________________________________________<br>
Paul Scherrer Institut <br>
Pavel Trtik<br>
WBBA/107<br>
Forschungsstrasse 111<br>
5232 Villigen PSI<br>
Schweiz<br>
<br>
Telefon: +41 56 310 55 79<br>
E-Mail: pavel.trtik@psi.ch </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> fast-neutrons-bounces@neutronsources.org <fast-neutrons-bounces@neutronsources.org>
<b>On Behalf Of </b>Michael Taylor<br>
<b>Sent:</b> Samstag, 16. November 2019 19:46<br>
<b>To:</b> fast-neutrons@neutronsources.org<br>
<b>Subject:</b> [Fast-Neutrons] First fast neutron images at Phoenix<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Good day to all, <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">I am happy to announce that we've taken our first fast neutron images at the Phoenix facility in Wisconsin, USA! Our source is operational now with a source strength of approximately
1.5e12 n/s and an L/D of 450 to achieve a flux at the image plane of approximately 5e5 n/cm^2-s. Over the next few weeks, we will be increasing our beam current and changing our target to a different material. We expect to get to full power and have a source
strength of 3e13 n/s and a flux at the image plane of approximately 1e7 n/cm^2-s. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">The image attached was taken using a Varex XRD 1621 digital detector array and a PP:ZnS(Cu) screen provided by RCTritec. The scintillator field of view is 310mm x 310mm, but we
plan to use the full field of view of the detector eventually, which is 430mm x 430mm. The image was taken last night and acquired with 15 frames at 20 seconds each. The frames were then added and the offsets were applied for background corrections. The
sample is a simulated M982 military round. It is 155mm in diameter. The outside casing is 1/8" steel and the inside simulant is an HMX equivalent, </span><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:white">6% 6656
binder (simulated with 204 epoxy). Chemically it is similar to </span><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D">HMX<span style="background:white"> and RDX but with much less nitrogen. I have outlined some of the defects of
interest that we want to see. </span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:white">We would like to measure the resolution of the system next so I would like to ask if anyone has advice on what material to use as an edge and how
thick it should be? We do not yet have any kind of standard measurement technique for this that I'm aware of, so I would like to know what others are doing.</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:white">I've also attached a new image we acquired using thermal neutrons of several different military grade .50 caliber ammunition. We took an X-ray
image for comparison and that is shown as well. The X-ray was done at 350kV but I don't recall the current. The neutron image was acquired using our thermal neutron generator with heavy water moderator, the L/D was 35 and the flux was approximately 1e4 n/cm^2-s.
The exposure time on a neutron sensitive image plate was 20 minutes. </span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:white">I hope everyone is well, it was great to meet so many of you in Garching last month and I wish you all happy holidays as they approach us soon.</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:white">Best regards,</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:white">Michael </span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D;background:white">Michael Taylor Ph.D.</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D">Neutron Radiography Product Manager</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D">Phoenix LLC</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D">2555 Industrial Drive</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D">Madison, WI 53717</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#1D1C1D">608-515-3214</span><o:p></o:p></p>
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