Tc-99m production??????????????????? (1 Viewer)

[addoil]

I found on an old thread how Tc-99m is produced:

Technetium-99m is made in one of two ways:
1. Fission of uranium-235 produces Mo-99. This isotope decays into Tc-99m
2. A Mo-98 target is introduced into the core of a nuclear reactor, where it undergoes neutron capture to produce the desired molybdenum-99.

⁹⁸Mo + ¹n ---> ⁹⁹Mo

⁹⁹Mo ---beta decay---> ^99mTc + _-1e

^99mTc ---gamma decay---> ⁹⁹Tc + gamma

What I don't understand is, if Mo-99 is already a fission product of U-235, which in turn can produce Tc-99m; then why is the Mo-98 required to create Mo-99?

Is it correct if i summarise the production method as follows:
1. U-235 undergoes nuclear fission to produce Mo-98
2. Mo-98 undergoes neutron bombardment to produce Mo-99
⁹⁸Mo + ¹n ---> ⁹⁹Mo
3. Mo-99 undergoes beta decay to produce Tc-99m
⁹⁹Mo ---beta decay---> ^99mTc + _-1e

 

[Parvee]

As it is said above there is two different ways of producing Tc-99m
Either way you can end up with Mo-99 which will decay and produce Tc-99m

 

[addoil]

As it is said above there is two different ways of producing Tc-99m
Either way you can end up with Mo-99 which will decay and produce Tc-99m

So my summary/method is still correct yeah?

 

[Parvee]

Oh and if your wondering why they use Mo-98, it is due to it being a natural isotope of Mo

 

[addoil]

Oh and if your wondering why they use Mo-98, it is due to it being a natural isotope of Mo

Lolwaitwut so; is it necessary to produce Mo-98 through U-235 neutron bombardment? >.<

 

[Parvee]

Um I think your getting the two different methods confused
One method of producing Tc-99m is by radioactive decay using Mo-99 which is a fission product of U-235
The second method is using the isotope Mo-98 which can be bombarded by a neutron to produce Mo-99 which then undergoes radioactive decay to produce Tc-99m

 

[Parvee]

Lolwaitwut so; is it necessary to produce Mo-98 through U-235 neutron bombardment? >.<

Mo-99 is a fission product of uranium-235 not Mo-98

 

[Kingportable]

Techneitum-99m
Is formed by the beta decay of molybdenum-99 which is produced by bombarding molybdenum-98 with protons, in a linear accelerator. Note that this is done in a cyclotron near the or inside the hospital using it because of technetium’s short life span.
99/42Mb à 99/43Tc + 0/-1eTechneitum-99m
Is formed by the beta decay of molybdenum-99 which is produced by bombarding molybdenum-98 with protons, in a linear accelerator. Note that this is done in a cyclotron near the or inside the hospital using it because of technetium’s short life span.
99/42Mb à 99/43Tc + 0/-1e