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Old 01-21-2007, 06:30 PM  
Simplex3 Simplex3 is offline
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The Beryllium Thread

I'm putting this in here so that it won't hang around the top of the lounge while I cut and paste information in to post after post.

This is part of my ongoing offseaon attempt to get us ranked on the first page of some search engine(s) when nerds search for "beryllium".

Before you PM me with "Why?", the answer is simply that I am sitting around reading log files at work and cutting and pasting into this thread requires absolutely NO mental stress.

Last edited by Dartgod; 04-14-2011 at 09:18 PM..
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Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.Simplex3 would the whole thing.
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Old 08-04-2011, 02:39 AM   #7141
KurtCobain KurtCobain is offline
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9
4Be + n → 2(4
2He) + 2n


Last edited by KurtCobain; 10-26-2011 at 06:40 PM..
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Old 08-04-2011, 02:39 AM   #7142
KurtCobain KurtCobain is offline
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As a metal, beryllium is transparent to most wavelengths of X-rays and gamma rays, making it useful for the output windows of X-ray tubes and other such apparatus.
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Old 08-04-2011, 02:40 AM   #7143
KurtCobain KurtCobain is offline
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It is also a good source for the relatively-small numbers of free neutrons in the laboratory which are liberated when beryllium nuclei are struck by energetic alpha particles[3] producing the nuclear reaction
9
4Be + 4
2He → 12
6C + n , where 4
2He is an alpha particle and 12
6C is a carbon-12 nucleus.[4]
[edit]Isotopes and nucleosynthesis
Main articles: Isotopes of beryllium and beryllium-10
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Old 08-04-2011, 02:40 AM   #7144
KurtCobain KurtCobain is offline
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Plot showing variations in solar activity, including variation in 10Be concentration.
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Old 08-04-2011, 02:41 AM   #7145
KurtCobain KurtCobain is offline
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Note that the beryllium scale is inverted, so increases on this scale indicate lower 10Be levels
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Old 08-04-2011, 02:42 AM   #7146
KurtCobain KurtCobain is offline
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Beryllium contains only one stable isotope, 9Be, and therefore is a monoisotopic element.
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Old 08-04-2011, 02:42 AM   #7147
KurtCobain KurtCobain is offline
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Cosmogenic 10Be is produced in the atmosphere of the Earth by the cosmic ray spallation of oxygen and nitrogen.


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KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.
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Old 08-04-2011, 02:43 AM   #7148
KurtCobain KurtCobain is offline
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Cosmogenic 10Be accumulates at the soil surface, where its relatively long half-life (1.36 million years) permits a long residence time before decaying to boron-10.
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Old 08-04-2011, 02:43 AM   #7149
KurtCobain KurtCobain is offline
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Thus, 10Be and its daughter products are used to examine natural soil erosion, soil formation and the development of lateritic soils, and as a proxy for measurement of the variations in solar activity and the age of ice cores.[5]
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Old 08-04-2011, 02:43 AM   #7150
KurtCobain KurtCobain is offline
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The production of 10Be is inversely proportional to the solar activity,


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KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.
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Old 08-04-2011, 02:43 AM   #7151
KurtCobain KurtCobain is offline
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because the increased solar wind during periods of high solar magnetic activity in turn decreases the flux of galactic cosmic rays that reach the Earth.
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Old 08-04-2011, 02:44 AM   #7152
KurtCobain KurtCobain is offline
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Nuclear explosions also form 10Be by the reaction of fast neutrons with 13C in the carbon dioxide in air.
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Old 08-04-2011, 02:44 AM   #7153
KurtCobain KurtCobain is offline
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This is one of the indicators of past activity at nuclear weapon test sites.[6]
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Old 08-04-2011, 02:45 AM   #7154
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The isotope 7Be (half-life 53 days) is also cosmogenic, and shows an atmospheric abundance linked to sunspots much like 10Be.
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KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.KurtCobain is obviously part of the inner Circle.
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Old 08-04-2011, 02:45 AM   #7155
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8Be has a very short half-life of about 7×10−17 s that contributes to its significant cosmological role, as elements heavier than beryllium could not have been produced by nuclear fusion in the Big Bang.[7]
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