Difference between revisions of "Mo-99 Production"
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The above report suggests that | The above report suggests that | ||
| − | 1.) you get about <math>10^{12} \frac{neutrons}{s kW}</math> when a 30 MeV electron beam hits a converter like Tungsten producing photons which hit a 5 cm thick Moly target. | + | 1.) you get about <math>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>^{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) | 2.) The <math>^{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) | ||
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| + | 3.) single neutron emissions makes up about 60% of the photofission X-section <math>\Rightarrow</math> <math>^{100}Mo(\gamma, n)</math> X-sect is about 96 mbarns when photon energy is 15 MeV | ||
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| + | 4.) 40 million nuclear medicine procedures are performed each year, 20 million in the US. 80% of those procedures use Mo-99. | ||
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| + | 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>\Rightarrow</math> 14,000 curies per week. | ||
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| + | Combining "1" and "5" means I need a 12 Watt dedicated electron machine to make Mo-99 each week for the U.S.? | ||
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| + | 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. | ||
Latest revision as of 02:04, 31 December 2010
The above report suggests that
1.) you get about 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 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 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). 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.