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#6781 |
legend
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4Be + n → 2(4
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#6782 |
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2He) + 2n
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#6783 |
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Beryllium is also 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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#6784 |
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Also, beryllium is a good source for relatively-small numbers of free neutrons in the laboratory.
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#6785 |
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These are liberated when beryllium nuclei are struck by energetic alpha particles[3] producing this nuclear reaction:
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#6786 |
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4Be + 4
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#6787 |
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2He → 12
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#6788 |
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6C + n
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#6789 |
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where 4
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#6790 |
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2He is an alpha particle and 12
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#6791 |
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6C is a carbon-12 nucleus.[4]
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#6792 |
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[edit]Isotopes and nucleosynthesis
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#6793 |
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Main articles: Isotopes of beryllium and beryllium-10
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#6794 |
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Plot showing variations in solar activity, including variation in 10Be concentration.
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#6795 |
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Note that the beryllium scale is inverted, so increases on this scale indicate lower 10Be levels
9Be is the only stable isotope. |
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