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Manipal MET2010PhysicsNuclear Physics

A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. Calculate the minimum time after which it would be possible to work safely with this source.

Options

  1. A12 h
  2. B24 h
  3. C6 h
  4. D130 h

Correct answer

A. 12 h

Step-by-step solution

For working safely, the activity must reduce to 1 64 . N N₀ = ( 1 2 )^n= 1 64 n=6 Thus, t=n T=6 2=12 ~h

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