Radioactive Decay & Half Life

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14 Terms

1
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Alpha Decay

  • Mass # - 4

  • Atomic # - 2


2
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<p>Do this with Th —&gt; Mass = 232 and Atomic = 90</p>

Do this with Th —> Mass = 232 and Atomic = 90

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3
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<p></p>


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4
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Beta Decay

Atomic # + 1

5
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6
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7
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Formed vs Undergoes

Formed

  • Goes on the right of the equation (B)


Undergoes

  • Goes on the left of the equation (A)


<p>Formed </p><ul><li><p>Goes on the right of the equation (B)</p></li></ul><p></p><p>Undergoes</p><ul><li><p>Goes on the left of the equation (A)</p></li></ul><p></p>
8
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Gamma Decay

Nothing changes

<p>Nothing changes</p>
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Half-life

The amount of time required for one-half of a radioactive substance to decay

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Half life of 5.26 days; after 31.56 years, 4.25 grams remained

272 grams was the original

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X had a half life of 5 secs, what percentage of the original remained about 20?

6.25% (divide by 2 4x)

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How many half lives have passed if 12.5% of the original remained

3 half lives

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14
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Half life of 3 months, how much will remain of 7200 grams after 1.75 years

56.25 grams