Q:

Which of the following is the principal unit used when measuring the energy of ionising radiation?

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Which of the following is the principal unit used when measuring the energy of ionising radiation? 


  1. joule
  2. electron-volt
  3. gray
  4. sievert

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B: the electron volt, or keV or MeV is preferred to the joule as the energy of a photon is a tiny fraction of one joule.

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