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13-Nuclear Medicine (x-ray (relies on absorption by different parts of the…
13-Nuclear Medicine
x-ray
relies on absorption by different parts of the body by different amounts of an external radiation source
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Pet Detectors
desirable properties
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fast decay time
to minimised pulse pile up, give high confidence timing and high live time
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technology
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Scintillators
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chance of photoelectric interaction increases rapidly with with Z, proportional to z^3
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Photomultiplier
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photons enter, electrons are emitted into the vaccum and multiplied due to high fields between dynodes
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good for clinical research and diagnosis (tumors, brain function, cell activity)
Dosimetry
weighting factors Wr
1 for X-rays, gammas, betas, and muons
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