lol, long live the Zeta Reticulians.

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There is a machine called a P.E.T. scan machine. It uses very small amounts of antimater (yes i said antimatter) that it introduces into the brain or body somewhere and after it reacts with the tissue it gives off gama radiation that a computer then annalizes and then gives you an image. Just give it some time and one day we may be able to meet those zeta reticulans.

 

Squigy, you know the saying “Don’t believe everything you see on TV”?

Now keep in mind that YouTube doesn’t have all the checks and balances that TV does.…

 

squigy,

Positron emission tomography - Wikipedia, the free encyclopedia

positron-emitting radionuclide ≠ antimatter

Ken

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I am not versed in this positron subject, but here is what Wiki says about a positron:
The positron or antielectron is the antiparticle or the antimatter counterpart of the electron.

It is common in biology to inject Isotopes into an organism and use it as a tracer to follow a process, so a PET scan sounds similar to this. I doubt this Positron thing is like converting a rock into a steak (replicator) like you see on Startrek.

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I think Ken means the radionuclide used in the machine is not antimatter, which is correct. However, the emitted positrons certainly are.

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Yeah, but the original assertion that antimatter is injected into the subject is poppycock. We're a long way off from being able to produce or contain antimatter on a non-microscopic scale. The positron in this case only exists for a stunningly short period of time before it slams into the first electron it can find and both the positron and electron are annihilated.


Torben

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Hmm, interesting, as the law of thermodynamics states that nothing is created nor destroyed, so what becomes of these illusive subatomic mysteries?

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When the positron and electron meet, they mutually annihilate, emitting a pair of high-energy photons which travel outward in opposite directions, according to Wikipedia. The scanner is set to detect pairs arriving like that (within nanoseconds of each other) to eliminate false positives from random passing gamma photons which might run into its sensors.

So while the electron and positron are destroyed, it turns out that the ash from a positron-electron fire is gamma photons. Kinda like water is the ash from a hydrogen-water fire. Which is why water makes a lousy fuel: it's ash.


Torben

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Very cool... That makes sense...

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With annihilation two 511 keV gammas take off in opposite directions.

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For that matter, people do demos of this in classroom, etc. They use a strong electromagnet, positrons from Na-22 and electrons from Kr-85. When combined in the magnet, the antimatter annihilation causes both particles to cease to exist and in their place the aforementioned pair of 511 keV gammas.

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I wonder if that is what Bruce Banner did when he turned into the Hulk

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NA-22 naturaly gives off positrons? News to me. So why cant we just use that as a source of antimatter? electrons are everywhere and impossible to completely remove? There must be a catch, there always is or i probably just didnt understand something. so the electromagnet contains everything and the krypton supplies electrons or what. Is there some sort of a name for this demonstration? How can i learn more?

 

Yes, the Na-22 gives off positrons---many other radionuclides do too---and they are indeed already used as sources of anti-particles! We must be speaking past each other...

In the demo the Krypton supplies the electrons, as I mentioned, and the magnet contains the reaction, yes. In nature positrons emitted by any radionuclide annihilate with surrounding electrons without our implicit observation and generate gammas all the time.

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