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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Dear Michael,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">these image data show very well the advantages of NI compared<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">to X-rays how to detect explosives and to characterize the bullet<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">status. However, the X-ray data can be taken in a synergetic manner<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">too.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">When I understand it right, your detection system for fast neutrons<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">is an a-Si flat panel coupled to the PP-scintillator from RC Tritec ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Do you intend to use camera systems too in the future? Their
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">advantage might be not to expose the panel and its electronics with<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">the radiation …<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Do you know something about the gamma background of your
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">facility and the contribution to the image?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">With respect to an edge, my proposal is to use W of about 10 mm.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">How did you determine the L/D = 450 for the fast neutrons?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I believe, your data are well suitable to justify further development<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">in FNI. Let’s continue our communication of latest results in this<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">informal way via the network.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Best regards and congrats for the excellent work<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Eberhard<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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"><span lang="EN-US" style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">__________________________________________<br>
Paul Scherrer Institut <br>
Dr. Ebe</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">rhard H. Lehmann<br>
WBBA/122<br>
Forschungsstrasse 111<br>
5232 Villigen PSI<br>
Schweiz<br>
<br>
Telefon: +41 56 310 29 63<br>
E-Mail: eberhard.lehmann@psi.ch </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><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="DE" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Von:</span></b><span lang="DE" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> fast-neutrons-bounces@neutronsources.org <fast-neutrons-bounces@neutronsources.org>
<b>Im Auftrag von </b>Michael Taylor<br>
<b>Gesendet:</b> Samstag, 16. November 2019 19:46<br>
<b>An:</b> fast-neutrons@neutronsources.org<br>
<b>Betreff:</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"><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"><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"><br>
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</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"><br>
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</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"><br>
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</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"><br>
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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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</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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