Mo-99 Production: Difference between revisions
m Protected "Mo-99 Production" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite) [read=autoconfirmed] (indefinite)) |
m Changed protection level for "Mo-99 Production" ([edit=brian] (indefinite) [move=brian] (indefinite) [read=autoconfirmed] (indefinite)) |
(No difference)
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Revision as of 20:05, 24 September 2009
The above report suggests that
1.) you get about [math]\displaystyle{ 10^{12} \frac{neutrons}{s \cdot kW} }[/math] when a 30 MeV electron beam hits a converter like Tungsten producing photons which hit a 5 cm thick Moly target. A 100 kW electron beam could make about 800 Ci/s of Mo-99.
2.) The [math]\displaystyle{ ^{100}Mo(\gamma, f) }[/math] X-sect peaks at 160 mbarns when the photon energy is 15 MeV:(photofission of Mo-100 and U-238 have similar X-sections)
3.) single neutron emissions makes up about 60% of the photofission X-section [math]\displaystyle{ \Rightarrow }[/math] [math]\displaystyle{ ^{100}Mo(\gamma, n) }[/math] X-sect is about 96 mbarns when photon energy is 15 MeV
4.) 40 million nuclear medicine procedures are performed each year, 20 million in the US. 80% of those procedures use Mo-99.
5.) The U.S. uses 6,000 - 7,000 6-day curies per week. 6-day curies = amount of Mo-99 left after 6 days ( half life is 66 hours < 3 days). [math]\displaystyle{ \Rightarrow }[/math] 14,000 curies per week.
Combining "1" and "5" means I need a 12 Watt dedicated electron machine to make Mo-99 each week for the U.S.?
If my technique for making Mo-99 uses 10, 50 micron thick foils of Mo-100 instead of a 5 cm thick target, then I need a 1200 Watt electron accelerator.