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23 Cards in this Set
- Front
- Back
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Decay Schematics
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The placement of the daughter relative to the parent in a decay scheme signifies the type of decay taking place
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An arrow down right =
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beta decay
gain a proton |
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An arrow to the down left =
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positron decay, electron capture
lose a proton |
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An arrow straight down =
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A Gamma decay
no change |
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An arrow down left =
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Alpha decay
lose 2 protons |
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Activity
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Describes the amount of radiation emitted by a radioisotope.
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The Curies & Becquerel are the basic units for
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radioactivity
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Co 57 & Cs 137
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Each day in the hospital you need to check your dose calibrator
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1 Curie =
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3.7 x 10E10 dps
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The Curies number comes from the measured activity of one gram of radium
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measured at 1 meter
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Typically in NM, we use fractions of Curies such as
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millicuries & microcuries
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1 Bq =
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1dps
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Since the Bq is a very small unit, we typically use large multiples measurement in NM such as
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megabequerels (MBq) & gigabequerels (GBq)
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Millicurie =
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3.7 x 10E7 dps
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Microcurie =
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3.7 x 10E4 dpa
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The radiation emitted by a specific radioisotope per unit is a constant,
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it cannot change no matter what!
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The half life is a constant, which is used to describe the rate of
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disintegration for a radioisotope.
t1/2 = half life |
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Isotopes with shorter half lives emit more
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radiation over shorter time!
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Isotopes with longer half lives emit
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less energy but do so over a longer time.
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A0 =
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initial activity
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A1 =
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final activity
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x =
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.693/t1/2
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t =
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time of decay
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