<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Dear George,</div><div>As advised by Doug, I read through Bindu's thesis. If his predictions hold,</div><div>the demand is in Curies. Doug is the best source for such information.</div><div>-H</div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Neil George" <neil@jlab.org><br><b>To: </b>isotope-prod@jlab.org<br><b>Sent: </b>Saturday, January 9, 2016 11:04:57 AM<br><b>Subject: </b>Re: [Isotope-prod] Comments on Ga activation rates<br></div><div><br></div><div data-marker="__QUOTED_TEXT__">George<br>I think this is great and I like the idea of the small mass (especially <br>if we are starting with the ultrapure target).<br>My only question is: what is the potential market for this isotope? <br>There is no point in making 200 mCi if you can only sell 10 mCi at a <br>given point in time. I thought I had asked this question before and <br>gotten an answer around 10 mCi but maybe I didn't state it clearly.<br>If you had 200 mCi to sell would there be enough buyers?<br>George<br><br><br>On 1/8/2016 5:10 PM, George Kharashvili wrote:<br>> Dear collaboration members,<br>><br>> I did some modeling to include activation rates of various targets mentioned yesterday. Here are some conclusions:<br>> - There is no good reason to increase radiator thickness - 1 to 1.5 mm tungsten is optimal.<br>> - 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:<br>> 3cm diameter, 5 cm long cylinder (m=210g) - 10 mCi/h/50kW<br>> 3cm diameter, 10 cm long cylinder (m=420g) - 12 mCi/h/50kW<br>> Truncated cone D1=1.5cm D2=10.6cm H=6.5cm (m=1310g) (currently in the proposal) - 13 mCi/h/50kW<br>> Truncated cone D1=2cm D2=6cm H=10cm (m=800g) - 12 mCi/h/50kW<br>> Truncated cone D1=1.5cm D2=15.5cm H=10cm (m=4110g) - 15 mCi/h/50kW<br>><br>> 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.<br>><br>> I hope this information is useful for the proposal.<br>><br>> --<br>> George Kharashvili<br>> Jefferson Lab Radiation Control<br>> 757-269-6435<br>> _______________________________________________<br>> Isotope-prod mailing list<br>> Isotope-prod@jlab.org<br>> https://mailman.jlab.org/mailman/listinfo/isotope-prod<br><br>_______________________________________________<br>Isotope-prod mailing list<br>Isotope-prod@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/isotope-prod<br></div></div></body></html>