Radioactive nuclei that are injected into a patient collect at certain sites within their body,undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called:

  • A
    Gamma camera
  • B
    $CAT$ scan
  • C
    Radiotracer technique
  • D
    Gamma ray spectroscopy

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The modern treatment method $P.E.T.$ is based on:

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