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Radioactive inclusions in quartz
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Author:  zbhjzm [ Mon Dec 11, 2017 8:35 am ]
Post subject:  Radioactive inclusions in quartz

Radioactive inclusions in quartz, most likely to be uraninite. Tension fractures and dark halos are caused by radiation damage.

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uraninite 1.jpg
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uraninite 2.jpg
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uraninite 3.jpg
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Author:  zbhjzm [ Mon Dec 11, 2017 8:37 am ]
Post subject:  Re: Radioactive inclusions in quartz

Another specimen with uraninite inclusions.

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uraninite 5.jpg
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uraninite 6.jpg
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Author:  Barbra Voltaire, FGG [ Mon Dec 11, 2017 2:19 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Really interesting. Not too dissimilar from the zircon inclusions in diamond.

Author:  ROM [ Mon Dec 11, 2017 3:11 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Where is this material from?

Author:  zbhjzm [ Mon Dec 11, 2017 11:55 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Barbra Voltaire wrote:
Really interesting. Not too dissimilar from the zircon inclusions in diamond.

Yes, but they are not quite common in quartz.

Author:  zbhjzm [ Mon Dec 11, 2017 11:56 pm ]
Post subject:  Re: Radioactive inclusions in quartz

ROM wrote:
Where is this material from?

They are from Brazil.

Author:  zbhjzm [ Tue Dec 12, 2017 1:39 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Specimens of this type:
Specimen 1 only has radiation halos, no inclusion inside.
Specimen 2 has a radiation halo so dark which makes the inclusion indiscernible.
Specimen 3 is a carving.Mutant golden fish with radioactive eyes.(Quite a match)

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uraninite01.jpg
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uraninite02.jpg
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uraninite03.jpg
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Author:  Barbra Voltaire, FGG [ Wed Dec 13, 2017 6:14 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Have any of these specimens been tested with a Geiger Counter?

Author:  zbhjzm [ Wed Dec 13, 2017 11:27 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Barbra Voltaire wrote:
Have any of these specimens been tested with a Geiger Counter?

They've all been tested, no radiation detectable.I guess the radiation of the inclusions is weak and can be contained in the quartz.

Author:  Brian [ Thu Dec 14, 2017 1:55 am ]
Post subject:  Re: Radioactive inclusions in quartz

zbhjzm wrote:
They've all been tested, no radiation detectable.I guess the radiation of the inclusions is weak and can be contained in the quartz.

The radioactive decay of uranium and its daughter isotopes produce alpha and beta radiation. Alpha (helium nuclei) and beta (electrons) created in the decays have a lot of kinetic energy, but don’t penetrate very far. So the radiation isn’t exactly weak, but it is contained within the quartz.

Very cool to be able to see the effects of radiation damage without having to worry about the radiation itself.

Author:  zbhjzm [ Thu Dec 14, 2017 2:55 am ]
Post subject:  Re: Radioactive inclusions in quartz

Brian wrote:
zbhjzm wrote:
They've all been tested, no radiation detectable.I guess the radiation of the inclusions is weak and can be contained in the quartz.

The radioactive decay of uranium and its daughter isotopes produce alpha and beta radiation. Alpha (helium nuclei) and beta (electrons) created in the decays have a lot of kinetic energy, but don’t penetrate very far. So the radiation isn’t exactly weak, but it is contained within the quartz.

Very cool to be able to see the effects of radiation damage without having to worry about the radiation itself.

Yes, it's a good thing there's no γ radiation produced by the inclusions.

Author:  Stephen Challener [ Thu Dec 14, 2017 4:30 am ]
Post subject:  Re: Radioactive inclusions in quartz

It's also probably had an awful long time to soak. Nothing I'd be too worried about on human timescales.

Author:  zbhjzm [ Thu Dec 14, 2017 4:49 am ]
Post subject:  Re: Radioactive inclusions in quartz

Stephen Challener wrote:
It's also probably had an awful long time to soak. Nothing I'd be too worried about on human timescales.

Yes,the dark halos probably take billion years to form.:D

Author:  Brian [ Thu Dec 14, 2017 3:46 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Well, the half life for uranium 238 decay is 4.5 billion years, about the same as the age of the earth. So those halos will continue darkening for several more billion years.

Author:  zbhjzm [ Thu Dec 14, 2017 10:40 pm ]
Post subject:  Re: Radioactive inclusions in quartz

Brian wrote:
Well, the half life for uranium 238 decay is 4.5 billion years, about the same as the age of the earth. So those halos will continue darkening for several more billion years.

Yes, that's nice. =D>

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