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NEST2021PhysicsNuclear Physics

The photon flux of a one curie gamma ray source incident on a human tissue of cross-sectional area 1.0 ~cm ^2 decreases exponentially with tissue depth x I(x)=I₀ (- x) where is the attenuation constant and I is the flux. Let E=1 MeV be the average energy of the incident gamma ray photon and be the surface mass density of the tissue. Select the correct statement(s): (One curie is 3.7 10¹⁰ disintegrations per second)

Options

  1. AE I₀ is of order 0.1 Watt / m ^2 .
  2. BAt a distance of x=3 / I is close to 0.37 I₀ .
  3. CE I / has dimensions of L ^2 ~T ⁻³ .
  4. DThe attenuation constant for beta rays will be larger than that for photons of similar energy.

Correct answer

D. The attenuation constant for beta rays will be larger than that for photons of similar energy.

Step-by-step solution

No solution available.

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