Q:

Why is a radionuclide with a short half-life and which emits low energy gamma radiation preferred for in vivo diagnosis? Because they

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Why is a radionuclide with a short half-life and which emits low energy gamma radiation preferred for in vivo diagnosis? Because they


  1. have a low activity.
  2. are highly penetrating.
  3. emit their radiation in a short time span.
  4. are very damaging to cancerous tissue.

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C: Having a short half-life means that lot of radiation is emitted in a short time period. If the radiation was emitted over a long time, the patient would be required to lie motionless for that long time while the image (the scintigram) was produced.

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