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Solve the equation for N nuclei of a particular radioactive isotope 2- where λ is defined...

  1. Solve the equation for N nuclei of a particular radioactive isotope

    2- where λ is defined as the decay constant and has units of s-1, to give
  2. Consider a parallel hole collimator with length L, hole diameter d and septal thickness t, where L >> d and t. Calculate the thickness t such that only 5% of gamma-rays penetrate adjacent holes.
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