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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Question 1:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I could not find cross section data for 71Ga(g, alpha)67Cu, but found cross sections for 71Ga(g, xn) and 71Ga(g,xp), see attached file. May be we derive estimates
from these.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Question 2:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Tungsten is hard to dissolve, unless very concentrated nitric acid or aqua regia (conc. HNO3+ conc. HCL mixture) is used. Copper is readily soluble even in dilute
HCl; We can leach the Cu-67 from the W target container, using dilute HCl. We can determine if any W is leached in the Cu-67 sample, by ICP-MS, which can measure ppb (nanogram level). By the same method we can measure stable Cu to determine exact specific
activity of the produced 67Cu.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Another point to consider is that, although W does not react with oxygen at room temp. , it corrodes at temp.> 400 C.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Will discuss more at 1PM.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Jamal<o:p></o:p></span></p>
<p class="MsoNormal"><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">Jamal Zweit, PhD, DSc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Professor of Radiology,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Affiliate Professor of Radiation Oncology; Pathology; Biochemistry & Molecular Biology; and Chemistry<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Director, Center for Molecular Imaging<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Department of Radiology<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">School of Medicine<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Virginia Commonwealth University<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">1101 E. Marshall Street<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Sanger Hall, Room 8-022<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">PO Box 980031<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Richmond, VA 23298-0031<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">(804) 628 2791<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"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> Isotope-prod [mailto:isotope-prod-bounces@jlab.org]
<b>On Behalf Of </b>Pavel Degtiarenko<br>
<b>Sent:</b> Tuesday, May 03, 2016 10:36 AM<br>
<b>To:</b> Hari Areti <areti@jlab.org>; isotope production <isotope-prod@jlab.org><br>
<b>Subject:</b> [EXTERNAL] Re: [Isotope-prod] Target system REquirements<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Another R&D question for the Tungsten target: Tungsten is known to be quite brittle, and many thermal cycles could make it more so because of non-uniform heating by the beam and the internal stresses coming
with it. So the R&D will require corresponding assessments and tests.<o:p></o:p></p>
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<p class="MsoNormal">On 5/3/2016 9:53 AM, Pavel Degtiarenko wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi All,<br>
<br>
I think we have a couple of major R&D questions that should be addressed in this project.<br>
<br>
The first one, related to Physics: we need the cross sections for Ga-71(gamma,alpha)Cu-67 at least with some reasonable accuracy of 20-30%. All technical solutions will depend on that directly.<br>
<br>
The second one, related to the target R&D: the question of the attachment of Cu-67 to the Tungsten walls. Is there a chance that a large portion of Cu-67 produced in Gallium during the run will alloy itself with Tungsten and never come out. Is there any chemical
solution that could be used to wash/rinse the target after irradiation to extract Copper (but keep Tungsten)?<br>
<br>
Best regards,<br>
Pavel<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">On 5/2/2016 3:59 PM, Hari Areti wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Here is the beginning of writing down target system requirements. Add missing information,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">edit out errors, etc.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">-H<o:p></o:p></span></p>
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<p class="MsoNormal"><br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Isotope-prod mailing list<o:p></o:p></pre>
<pre><a href="mailto:Isotope-prod@jlab.org">Isotope-prod@jlab.org</a><o:p></o:p></pre>
<pre><a href="https://mailman.jlab.org/mailman/listinfo/isotope-prod">https://mailman.jlab.org/mailman/listinfo/isotope-prod</a><o:p></o:p></pre>
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