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What is a radionuclide with a short half-life (say 5 hours) said to be?

waelhammad
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2022-10-21
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What is a radionuclide with a short half-life (say 5 hours) said to be?

  1. highly radioactive.
  2. weakly radioactive.
  3. of high penetrating ability.
  4. of low penetrating ability.
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waelhammad
2022-10-21
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A: A radionuclide with a short half-life must be emitting a lot of radiation in that time as half of the nuclei present will have emitted their radiation. Hence it may be termed “highly radioactive”, albeit for a short time. 

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