<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hello Michael,</div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
Yes, I am back on my feet, but I am not running marathons anytime soon. We are not allowed to work, including checking emails, when we are on short-term disability like I was for five weeks. The emails sent to my INL email address sat stagnant and built up.
<span style="font-family: "Times New Roman", Times, serif; background-color: rgb(255, 255, 255); display: inline !important">
I returned to the office to find 610 unread emails, so getting caught up will take some time. </span>Some colleagues knew to email my gmail account (aaron.e.craft@gmail.com) when I am away from the office, so I was able to get some things done without the INL
no-work disability police taking notice. </div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
I have the PSI Siemens star that uses a thin layer of gadolinium layer for contrast with thermal/cold neutrons. If you were thinking of something for fast neutrons, I have a 3D printed polymer star somewhere, I just have to find it. You will need a much thicker
star for fast neutrons, which will make alignment in the center of the beam (no beam divergence) of critical importance. </div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
Indeed, I do plan on bringing the ASTM gauges with me to the meeting and working on the draft standard method document. The ASTM gauges were being calibrated to measure and certify the as-fabricated dimensions. I still need to pick them up. </div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
Kind regards,</div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
Aaron</div>
<div style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id="Signature">
<div></div>
<div id="divtagdefaultwrapper" dir="ltr" style="font-size:12pt; color:#000000; font-family:Calibri,Helvetica,sans-serif">
<p style="margin-top:0px; margin-bottom:0px; margin-top:0; margin-bottom:0"></p>
<p class="MsoNormal" style="margin-top:0px; margin-bottom:0px"><b><span style="color:rgb(68,68,68); font-size:12pt; font-family:"Times New Roman",Times,serif"></span></b></p>
<p style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; background:white">
<span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#FF9900">______________________________________________________________________</span><span style="color:black"></span><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#888888"></span></p>
<p style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; background:white">
<b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:black"> <img class="EmojiInsert" width="258.1967213114754" height="50" style="width:258.197px; height:50px" data-outlook-trace="F:1|T:1" src="cid:e74c2cd8-9d8f-48da-a27d-b97171a90981"></span></b></p>
<p style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; background:white">
<b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:black">Aaron E. Craft, Ph.D.</span></b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#888888"></span></p>
<p style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; margin-bottom:12.0pt; background:white">
<i><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#666666">R&D Scientist<br>
Characterization & Advanced Post-Irradiation Examination Division</span></i><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#888888"></span></p>
<p style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; background:white">
<b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#666666">Idaho National Laboratory | PO Box 1625 | Idaho Falls, ID 83415</span></b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#888888"></span></p>
<p style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; background:white">
<b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:black">Phone: 208-533-7673 | Cell: 208-201-4242 </span></b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:black"></span></p>
<p style="margin:0in 0in 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; background:white">
<span style="color:black"><span style="font-size:12pt; font-family:Arial,sans-serif; color:rgb(81,167,249)"><u>Aaron.Craft@inl.gov</u></span></span><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#888888"></span></p>
<p class="MsoNormal" style="margin-top:0px; margin-bottom:0px"><span style="font-size:12pt; font-family:"Times New Roman",Times,serif"></span></p>
<br>
<p style="margin-top:0px; margin-bottom:0px"></p>
</div>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Michael Taylor <Michael.Taylor@phoenixwi.com><br>
<b>Sent:</b> Thursday, January 9, 2020 4:54 PM<br>
<b>To:</b> Aaron E. Craft <aaron.craft@inl.gov>; Lehmann Eberhard (PSI) <eberhard.lehmann@psi.ch>; Alan <alan.hewat@gmail.com>; fast-neutrons@neutronsources.org <fast-neutrons@neutronsources.org><br>
<b>Subject:</b> RE: [EXTERNAL] Re: [Fast-Neutrons] Congrats! Re: First fast neutron images at Phoenix</font>
<div> </div>
</div>
<style>
<!--
@font-face
{font-family:"Cambria Math"}
@font-face
{font-family:Calibri}
p.x_MsoNormal, li.x_MsoNormal, div.x_MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif}
a:link, span.x_MsoHyperlink
{color:blue;
text-decoration:underline}
p.x_xxmsonormal, li.x_xxmsonormal, div.x_xxmsonormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif}
span.x_EmailStyle26
{font-family:"Calibri",sans-serif;
color:windowtext}
.x_MsoChpDefault
{font-size:10.0pt}
@page WordSection1
{margin:1.0in 1.0in 1.0in 1.0in}
div.x_WordSection1
{}
-->
</style>
<div lang="EN-US" link="blue" vlink="purple">
<div class="x_WordSection1">
<p class="x_MsoNormal">Hi Aaron, </p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">I hope your recovery has been going well. Are you back on your feet now? Thanks for lending us the Siemens star, what’s it made of? Are you going to be bringing the line pair gauges to Florida as well? I have a draft of the digital
guide almost ready for distribution also.</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Best,</p>
<p class="x_MsoNormal">Michael </p>
<p class="x_MsoNormal"> </p>
<div>
<p class="x_MsoNormal">Michael Taylor, Ph.D. </p>
<p class="x_MsoNormal">Neutron Radiography Product Manager -</p>
<p class="x_MsoNormal">Project Integration</p>
<p class="x_MsoNormal"><img width="102" height="131" id="x_Picture_x0020_1" alt="Phoenix2017small2" style="width:1.0625in; height:1.3645in" data-outlook-trace="F:1|T:1" src="cid:image001.png@01D5C715.E1AAB780"></p>
<p class="x_MsoNormal">Michael.Taylor@phoenixwi.com</p>
<p class="x_MsoNormal">2555 Industrial Drive</p>
<p class="x_MsoNormal">Madison, WI 53713</p>
<p class="x_MsoNormal">W: 608.210.3060</p>
<p class="x_MsoNormal">M: 608.515.3214</p>
</div>
<p class="x_MsoNormal"> </p>
<div>
<div style="border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0in 0in 0in">
<p class="x_MsoNormal"><b>From:</b> Aaron E. Craft <aaron.craft@inl.gov> <br>
<b>Sent:</b> Thursday, January 9, 2020 5:42 PM<br>
<b>To:</b> Michael Taylor <Michael.Taylor@phoenixwi.com>; Lehmann Eberhard (PSI) <eberhard.lehmann@psi.ch>; Alan <alan.hewat@gmail.com>; fast-neutrons@neutronsources.org<br>
<b>Subject:</b> Re: [EXTERNAL] Re: [Fast-Neutrons] Congrats! Re: First fast neutron images at Phoenix</p>
</div>
</div>
<p class="x_MsoNormal"> </p>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black">Hello Michael,</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><i><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black">Sorry for the slow response - I just returned to work this week after five weeks of recovering from ankle surgery and being out of the office. </span></i><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black"></span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black">I would be happy to lend you a Siemens star. I can bring it with me to the upcoming ASTM meeting. Sound good to you?</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black">Kind regards,<br>
Aaron</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:black"> </span></p>
</div>
<div id="x_Signature">
<div id="x_divtagdefaultwrapper">
<p style="background:white"><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#FF9900">______________________________________________________________________</span><span style="color:black"></span></p>
<p style="background:white"><b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:black"> <img width="258" height="50" id="x__x0000_i1025" style="width:2.6875in; height:.5208in" data-outlook-trace="F:1|T:1" src="cid:image003.png@01D5C715.E1B2CDD0"></span></b><span style="color:black"></span></p>
<p style="background:white"><b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:black">Aaron E. Craft, Ph.D.</span></b><span style="color:black"></span></p>
<p style="margin-bottom:12.0pt; background:white"><i><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#666666">R&D Scientist<br>
Characterization & Advanced Post-Irradiation Examination Division</span></i><span style="color:black"></span></p>
<p style="background:white"><b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#666666">Idaho National Laboratory | PO Box 1625 | Idaho Falls, ID 83415</span></b><span style="color:black"></span></p>
<p style="background:white"><b><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:black">Phone: 208-533-7673 | Cell: 208-201-4242 </span></b><span style="color:black"></span></p>
<p style="background:white"><u><span style="font-size:12.0pt; font-family:"Arial",sans-serif; color:#51A7F9"><a href="mailto:Aaron.Craft@inl.gov">Aaron.Craft@inl.gov</a></span></u><span style="color:black"></span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
</div>
<div class="x_MsoNormal" align="center" style="text-align:center">
<hr size="2" width="98%" align="center">
</div>
<div id="x_divRplyFwdMsg">
<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black">
<a href="mailto:fast-neutrons-bounces@neutronsources.org">fast-neutrons-bounces@neutronsources.org</a> <<a href="mailto:fast-neutrons-bounces@neutronsources.org">fast-neutrons-bounces@neutronsources.org</a>> on behalf of Michael Taylor <<a href="mailto:Michael.Taylor@phoenixwi.com">Michael.Taylor@phoenixwi.com</a>><br>
<b>Sent:</b> Thursday, December 12, 2019 1:49 PM<br>
<b>To:</b> Lehmann Eberhard (PSI) <<a href="mailto:eberhard.lehmann@psi.ch">eberhard.lehmann@psi.ch</a>>; Alan <<a href="mailto:alan.hewat@gmail.com">alan.hewat@gmail.com</a>>;
<a href="mailto:fast-neutrons@neutronsources.org">fast-neutrons@neutronsources.org</a> <<a href="mailto:fast-neutrons@neutronsources.org">fast-neutrons@neutronsources.org</a>><br>
<b>Subject:</b> [EXTERNAL] Re: [Fast-Neutrons] Congrats! Re: First fast neutron images at Phoenix</span>
</p>
<div>
<p class="x_MsoNormal"> </p>
</div>
</div>
<div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Hello all,</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Does anyone already have a printed Siemens star they'd be willing to ship to me for testing? Has anyone come up with another method for measuring resolution for fast neutron imaging? We are
otherwise going to image an edge on different pieces of material: Fe, W, Cu, Al, HDPE to see how they compare. </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Best regards,</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Michael</span></p>
</div>
<div class="x_MsoNormal" align="center" style="text-align:center">
<hr size="2" width="98%" align="center">
</div>
<div id="x_x_divRplyFwdMsg">
<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black">
<a href="mailto:fast-neutrons-bounces@neutronsources.org">fast-neutrons-bounces@neutronsources.org</a> <<a href="mailto:fast-neutrons-bounces@neutronsources.org">fast-neutrons-bounces@neutronsources.org</a>> on behalf of Lehmann Eberhard (PSI) <<a href="mailto:eberhard.lehmann@psi.ch">eberhard.lehmann@psi.ch</a>><br>
<b>Sent:</b> Monday, November 18, 2019 4:52 AM<br>
<b>To:</b> Alan <<a href="mailto:alan.hewat@gmail.com">alan.hewat@gmail.com</a>>;
<a href="mailto:fast-neutrons@neutronsources.org">fast-neutrons@neutronsources.org</a> <<a href="mailto:fast-neutrons@neutronsources.org">fast-neutrons@neutronsources.org</a>><br>
<b>Subject:</b> Re: [Fast-Neutrons] Congrats! Re: First fast neutron images at Phoenix</span>
</p>
<div>
<p class="x_MsoNormal"> </p>
</div>
</div>
<div>
<div>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">I disagree with Alan about the n-sensitive imaging plates: they are</span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">made by Fuji on a commercial base adding Gd to the X-ray sensitive</span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">material. Therefore the efficiency is not bad and much better than
</span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">film methods …</span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Regards</span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">Eberhard</span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span lang="DE-CH" style="font-size:10.0pt; font-family:"Calibri",sans-serif; color:#1F497D">__________________________________________<br>
Paul Scherrer Institut <br>
Dr. Eberhard 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: <a href="mailto:eberhard.lehmann@psi.ch">eberhard.lehmann@psi.ch</a> </span>
<span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span lang="DE-CH" style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><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">
<a href="mailto:fast-neutrons-bounces@neutronsources.org">fast-neutrons-bounces@neutronsources.org</a> <<a href="mailto:fast-neutrons-bounces@neutronsources.org">fast-neutrons-bounces@neutronsources.org</a>>
<b>Im Auftrag von </b>Alan<br>
<b>Gesendet:</b> Montag, 18. November 2019 10:43<br>
<b>An:</b> <a href="mailto:fast-neutrons@neutronsources.org">fast-neutrons@neutronsources.org</a><br>
<b>Betreff:</b> Re: [Fast-Neutrons] Congrats! Re: First fast neutron images at Phoenix</span><span lang="DE-CH"></span></p>
<p class="x_xxmsonormal"><span lang="DE-CH"> </span></p>
<div>
<div>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH">Hello Michael, Burkhard and Eberhard.</span></p>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH"> </span></p>
</div>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH">Thank you Michael for these nice images. I too am impressed by the resolution of your thermal images with an L/D of only 35, and agree that it would be good to take thermal images with a camera rather than a neutron
image plate. The ordinary Fuji n-plates are just x-ray plates with extra 6LiF and I think only ~10% efficient. ~20 years ago Fuji made special n-plates for ILL that were ~25% efficient but they are no longer available (?). You should be able to reduce the
exposure well below 20 minutes with a camera and a good 6LiF/ZnS thermal neutron scintillator even with only 10**4 n.cm-2.s-1. See the images Robert Zboray showed in Sydney from a very low flux Triga reactor, one of which I reproduced in my Munich talk.</span></p>
</div>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH"> </span></p>
</div>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH">It would also be good to compare your fast neutron image with a thermal neutron image using the same detector and L/D (with different scintillators). With such small objects, that can be put close to the scintillator,
it would be interesting to see if fast neutrons still have some advantage for imaging such defects.</span></p>
</div>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH"> </span></p>
</div>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH">I also found Burkard's and Eberhard's comments about the best material and thickness for a fast neutron Siemens star interesting. It would be good to see images with these different resolution objects. I also printed
a plastic Siemens star, but 40 mm thick, which I have not yet been able to test. A final trivial point; please don't use exponent e4 instead of 10**4 for flux; e has a different meaning for mathematicians.<br>
<br>
Thanks again for sharing. Alan</span></p>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH">______________________________________________________<br>
Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE <br>
from my telephone<br>
<<a href="mailto:Alan.Hewat@NeutronOptics.com">Alan.Hewat@NeutronOptics.com</a>> +33.476.98.41.68<br>
<a href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flinkprotect.cudasvc.com%2Furl%3Fa%3Dhttp%253a%252f%252fwww.NeutronOptics.com%252fhewat%26c%3DE%2C1%2CnsRpj7Ep0HI2dnJQS9mLWP7NTTRFa_A1rnHdA_hwLcr1LAK7nQ2-Td0N6b_DO9Ja1638KxTpmGVeliGNkSNhx7t1hvZbcROb-wXGKiiSSd4b_OlHxdBS0EA%2C%26typo%3D1&data=02%7C01%7Caaron.craft%40inl.gov%7C8abe09db7d27409cc5b308d7955f9a9c%7C4cf464b7869a42368da2a98566485554%7C0%7C0%7C637142110162750421&sdata=jh0ZDoEQ7IUa61DtFawLZdZsiZrgz7X8YfICNhOFtEs%3D&reserved=0" originalsrc="https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.NeutronOptics.com%2fhewat&c=E,1,nsRpj7Ep0HI2dnJQS9mLWP7NTTRFa_A1rnHdA_hwLcr1LAK7nQ2-Td0N6b_DO9Ja1638KxTpmGVeliGNkSNhx7t1hvZbcROb-wXGKiiSSd4b_OlHxdBS0EA,&typo=1" shash="Y5XKYT8nu3X4er+azx0IOwigpl5XN7QsLBZWvDVfuZl/W7gkzk7PgnjX1+QEvx7MJYmBQg+tijsQrwel2+wBNAp9OAmfkSQxAD+Xx9yTTFXMH9WynPC/rErMos2uiffSlrA3TlUAeu8/5Yl0vf+D50mD+8I2gt++OW3fXP7rm9Y=" target="_blank">http://www.NeutronOptics.com/hewat</a><br>
______________________________________________________</span></p>
</div>
</div>
</div>
</div>
<p class="x_xxmsonormal"><span lang="DE-CH"> </span></p>
<div>
<div>
<p class="x_xxmsonormal"><span lang="DE-CH">On Mon, 18 Nov 2019, 08:42 Burkhard Schillinger, <<a href="mailto:Burkhard.Schillinger@frm2.tum.de" target="_blank">Burkhard.Schillinger@frm2.tum.de</a>> wrote:</span></p>
</div>
<blockquote style="border:none; border-left:solid #CCCCCC 1.0pt; padding:0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; margin-bottom:5.0pt">
<p class="x_xxmsonormal"><span lang="DE-CH">Hello Michael,<br>
<br>
congratulations for these nice images!<br>
For a fast neutron image, that resolution is pretty good. Probably <br>
better than ours - which shows that a high collimation is also <br>
important for fast neutrons if you have large samples.<br>
<br>
I am also surprised again by your thermal image at L/D of only 35 - <br>
but that's what you get when you can put the samples up close to the <br>
detector.<br>
<br>
<br>
For an edge - about everything scatters fast neutrons, but I have <br>
tried with a 10 mm thick polyethylen pattern (Siemens Star) that was <br>
3D printed at our lab. When putting it directly on the detector, it <br>
was a good measure to test the screen. The 1.5 mm thickness screen was <br>
much better than the 2.4 mm.<br>
Not sure what really happens if you take it further away - I assume <br>
that 10 mm thickness is a good compromise between attenuation and <br>
scattering blur. You might try 10 mm steel as well, but iron is also a <br>
diffuse scatterer.<br>
A perfect edge does not exist.<br>
<br>
Good luck with your new 'toys', and Happy Holidays!<br>
<br>
Burkhard<br>
<br>
<br>
<br>
<br>
> Good day to all,<br>
><br>
> I am happy to announce that we've taken our first fast neutron <br>
> images at the Phoenix facility in Wisconsin, USA! Our source is <br>
> operational now with a source strength of approximately 1.5e12 n/s <br>
> and an L/D of 450 to achieve a flux at the image plane of <br>
> approximately 5e5 n/cm^2-s. Over the next few weeks, we will be <br>
> increasing our beam current and changing our target to a different <br>
> material. We expect to get to full power and have a source strength <br>
> of 3e13 n/s and a flux at the image plane of approximately 1e7 <br>
> n/cm^2-s.<br>
><br>
> The image attached was taken using a Varex XRD 1621 digital detector <br>
> array and a PP:ZnS(Cu) screen provided by RCTritec. The <br>
> scintillator field of view is 310mm x 310mm, but we plan to use the <br>
> full field of view of the detector eventually, which is 430mm x <br>
> 430mm. The image was taken last night and acquired with 15 frames <br>
> at 20 seconds each. The frames were then added and the offsets were <br>
> applied for background corrections. The sample is a simulated M982 <br>
> military round. It is 155mm in diameter. The outside casing is <br>
> 1/8" steel and the inside simulant is an HMX equivalent, 6% 6656 <br>
> binder (simulated with 204 epoxy). Chemically it is similar to HMX <br>
> and RDX but with much less nitrogen. I have outlined some of the <br>
> defects of interest that we want to see.<br>
><br>
> We would like to measure the resolution of the system next so I <br>
> would like to ask if anyone has advice on what material to use as an <br>
> edge and how thick it should be? We do not yet have any kind of <br>
> standard measurement technique for this that I'm aware of, so I <br>
> would like to know what others are doing.<br>
><br>
> I've also attached a new image we acquired using thermal neutrons of <br>
> several different military grade .50 caliber ammunition. We took an <br>
> X-ray image for comparison and that is shown as well. The X-ray was <br>
> done at 350kV but I don't recall the current. The neutron image was <br>
> acquired using our thermal neutron generator with heavy water <br>
> moderator, the L/D was 35 and the flux was approximately 1e4 <br>
> n/cm^2-s. The exposure time on a neutron sensitive image plate was <br>
> 20 minutes.<br>
><br>
> I hope everyone is well, it was great to meet so many of you in <br>
> Garching last month and I wish you all happy holidays as they <br>
> approach us soon.<br>
><br>
> Best regards,<br>
> Michael<br>
><br>
> Michael Taylor Ph.D.<br>
> Neutron Radiography Product Manager<br>
> Phoenix LLC<br>
> 2555 Industrial Drive<br>
> Madison, WI 53717<br>
> 608-515-3214<br>
<br>
<br>
<br>
-- <br>
Dr. Burkhard Schillinger<br>
Technische Universität München - FRM II<br>
Heinz Maier-Leibnitz Zentrum<br>
Lichtenbergstr.1<br>
D-85748 Garching<br>
Germany<br>
Tel. +49 89 289-12185<br>
<br>
_______________________________________________<br>
Fast-Neutrons mailing list<br>
<a href="mailto:Fast-Neutrons@neutronsources.org" target="_blank">Fast-Neutrons@neutronsources.org</a><br>
<a href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flinkprotect.cudasvc.com%2Furl%3Fa%3Dhttps%253a%252f%252fneutronsources.org%252fmailman%252flistinfo%252ffast-neutrons%26c%3DE%2C1%2CjwqsB9TTvJz9wzdKEM4CT4zoMezOjLtJUkW95eXQwCfEiAMGKg-OSABSGQ40Ckvu2HD70xqAjFLAhtENigaRLx5bUX2S57JzCNpaiqBOUfbronU%2C%26typo%3D1&data=02%7C01%7Caaron.craft%40inl.gov%7C8abe09db7d27409cc5b308d7955f9a9c%7C4cf464b7869a42368da2a98566485554%7C0%7C0%7C637142110162760411&sdata=AXgMdqZ7Xj%2FMGUYjLSTHFjGtIsAynWS%2BnL9d4A8%2Fiy0%3D&reserved=0" originalsrc="https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fneutronsources.org%2fmailman%2flistinfo%2ffast-neutrons&c=E,1,jwqsB9TTvJz9wzdKEM4CT4zoMezOjLtJUkW95eXQwCfEiAMGKg-OSABSGQ40Ckvu2HD70xqAjFLAhtENigaRLx5bUX2S57JzCNpaiqBOUfbronU,&typo=1" shash="aLkgSXEeujRpydflk7p4FEVgwNZoV3c/ZRv96nNS5i4iyrfnA9IoMc2O0n20EhVUewlNj/FBq/ySDkun94IhI4VfMeLSUC6cyuV5GW62EjkwyP/Hr9wH5ZwBSyYim433UYYdmh4Dgm3r/+E2VxRtD1+YEj9RkBw1hiu+SooMIlc=" target="_blank">https://neutronsources.org/mailman/listinfo/fast-neutrons</a></span></p>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>