[Isotope-prod] [EXTERNAL] Re: Target system REquirements

[Jamal Zweit]

Question 1:
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.

Question 2:
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.

Another point to consider is that, although W does not react with oxygen at room temp. , it corrodes at temp.> 400 C.

Will discuss more at 1PM.

Jamal

Jamal Zweit, PhD, DSc
Professor of Radiology,
Affiliate Professor of Radiation Oncology; Pathology; Biochemistry & Molecular Biology; and Chemistry
Director, Center for Molecular Imaging
Department of Radiology
School of Medicine
Virginia Commonwealth University
1101 E. Marshall Street
Sanger Hall, Room 8-022
PO Box 980031
Richmond, VA 23298-0031
(804) 628 2791

From: Isotope-prod [mailto:isotope-prod-bounces at jlab.org] On Behalf Of Pavel Degtiarenko
Sent: Tuesday, May 03, 2016 10:36 AM
To: Hari Areti <areti at jlab.org>; isotope production <isotope-prod at jlab.org>
Subject: [EXTERNAL] Re: [Isotope-prod] Target system REquirements

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.
On 5/3/2016 9:53 AM, Pavel Degtiarenko wrote:
Hi All,

I think we have a couple of major R&D questions that should be addressed in this project.

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.

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)?

Best regards,
Pavel


On 5/2/2016 3:59 PM, Hari Areti wrote:
Here is the beginning of writing down target system requirements. Add missing information,
edit out errors, etc.
Thanks,
-H




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