[Isotope-prod] Comments on Ga activation rates

[Hari Areti]

Dear George, 
As advised by Doug, I read through Bindu's thesis. If his predictions hold, 
the demand is in Curies. Doug is the best source for such information. 
-H 


From: "Neil George" <neil at jlab.org> 
To: isotope-prod at jlab.org 
Sent: Saturday, January 9, 2016 11:04:57 AM 
Subject: Re: [Isotope-prod] Comments on Ga activation rates 

George 
I think this is great and I like the idea of the small mass (especially 
if we are starting with the ultrapure target). 
My only question is: what is the potential market for this isotope? 
There is no point in making 200 mCi if you can only sell 10 mCi at a 
given point in time. I thought I had asked this question before and 
gotten an answer around 10 mCi but maybe I didn't state it clearly. 
If you had 200 mCi to sell would there be enough buyers? 
George 


On 1/8/2016 5:10 PM, George Kharashvili wrote: 
> Dear collaboration members, 
> 
> I did some modeling to include activation rates of various targets mentioned yesterday. Here are some conclusions: 
> - There is no good reason to increase radiator thickness - 1 to 1.5 mm tungsten is optimal. 
> - Activation rates presented in the proposal (17 mCi/h/kW at 40 MeV) were calculated for what can be assumed an infinite natural Ga target. Replacing it with other targets results in the following: 
> 3cm diameter, 5 cm long cylinder (m=210g) - 10 mCi/h/50kW 
> 3cm diameter, 10 cm long cylinder (m=420g) - 12 mCi/h/50kW 
> Truncated cone D1=1.5cm D2=10.6cm H=6.5cm (m=1310g) (currently in the proposal) - 13 mCi/h/50kW 
> Truncated cone D1=2cm D2=6cm H=10cm (m=800g) - 12 mCi/h/50kW 
> Truncated cone D1=1.5cm D2=15.5cm H=10cm (m=4110g) - 15 mCi/h/50kW 
> 
> If we take the smallest of these targets (~200g) and assume 20 hours of 50 kW beam (ignoring decay of Cu-67), we should produce ~200 mCi of Cu-67. This is roughly 260 nanograms, or 1.3 ppb of Cu-67 in our 200 g natural Ga target, which is greater than the 0.5 ppb of Cu content of 99.9999% Ga sample. 
> 
> I hope this information is useful for the proposal. 
> 
> -- 
> George Kharashvili 
> Jefferson Lab Radiation Control 
> 757-269-6435 
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> Isotope-prod at jlab.org 
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