Which copper isotope(s) are brass shell cartridges made of?


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Old 08-19-2011, 03:35 AM   #1
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Default Which copper isotope(s) are brass shell cartridges made of?

Which copper isotope(s) are brass shell cartridges made of (63Cu and/or 65Cu)? Or is the copper 29Cu?

Thanks,

Jake



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Old 08-19-2011, 03:49 PM   #2
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probably depends on the cartridges, but i would i imagine most commercial companies end up with a mixture of all recycled brass and then purify it with an electroplating process and then hardness test it.



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Old 08-19-2011, 04:38 PM   #3
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Cartridge brass is a 30% zinc brass. That places the copper content at 70% assuming no lead content. No Copper Isotope is used, it is CU. Isotopes of copper - Wikipedia, the free encyclopedia

Wrought copper alloy C26000 (Cartridge Brass) [SubsTech]

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Old 08-22-2011, 11:01 PM   #4
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I assume you are talking about 64Cu. However, that has a very short half-life according to the wikipedia page. Are you sure they don't use 63Cu and/or 65Cu? Those are the only stable forms of copper.

Anyone?

Thanks,

Jake
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Old 08-22-2011, 11:37 PM   #5
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Default Copper

Hello Jake,
The copper used in cartridges has all the naturally occurring isotopes in it. When copper is produced none of the isotopes are separated.

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Old 08-22-2011, 11:39 PM   #6
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I mean the base elemental Copper, Cu. On the periodic table of elements, Atomic number 29, group 11, period 4, block D, CAS registry ID 7440-50-8.

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Old 08-23-2011, 12:01 AM   #7
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Quote:
Originally Posted by BB98338 View Post
Hello Jake,
The copper used in cartridges has all the naturally occurring isotopes in it. When copper is produced none of the isotopes are separated.
But due to the very short half-lives of copper isotopes other than 63Cu and 65Cu, wouldn't there basically be just 63Cu and 65Cu in brass? Or, does the zinc stabilize all the isotopes? If so, does anyone know any approximation as to the percentages of 63Cu and 65Cu in brass?

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Jake
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Old 08-23-2011, 01:08 AM   #8
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Just what are you getting at Jake? I always thought Copper, like Hydrogen was a fairly stable element. Are you thinking of the effect of a nuclear blast on cartridge brass?

To my knowledge, the isotopes you are speaking of are man made and not naturally occuring, isn't that right?

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Old 08-23-2011, 01:40 AM   #9
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Default Copper isotopes

It's Elemental - Isotopes of the Element Copper
Hello Jake,
Here is the link I looked at showing the relative abundance of the copper isotopes. Natural copper would have this mix plus some minute traces of the others.
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Old 08-23-2011, 01:54 AM   #10
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Quote:
Originally Posted by dunerunner View Post
Just what are you getting at Jake? I always thought Copper, like Hydrogen was a fairly stable element. Are you thinking of the effect of a nuclear blast on cartridge brass?

To my knowledge, the isotopes you are speaking of are man made and not naturally occuring, isn't that right?
The only two stable isotopes of copper are 63Cu and 65Cu and they occur naturally. Copper, as on the periodic chart of elements, is not stable and has a half life of 12.7 hours. See the link whom BB98338 posted most recently.


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