Calculation of photon pulse height distribution using deterministic and Monte Carlo methods

• Generation of new multi-group gamma cross section library using Klein–Nishina relation.
• Benchmarking of the new generated multi-group gamma cross section library using ANISN and MCNP codes.
• Calculation of pulse height distribution using deterministic method: ANISN code and collided component program.
• Calculation of pulse height distribution using Monte Carlo method: MCNP and FLUKA codes.

Radiation transport techniques which are used in radiation detection systems comprise one of two categories namely probabilistic and deterministic. However, probabilistic methods are typically used in pulse height distribution simulation by recreating the behavior of each individual particle, the deterministic approach, which approximates the macroscopic behavior of particles by solution of Boltzmann transport equation, is being developed because of its potential advantages in computational efficiency for complex radiation detection problems. In current work linear transport equation is solved using two methods including collided components of the scalar flux algorithm which is applied by iterating on the scattering source and ANISN deterministic computer code. This approach is presented in one dimension with anisotropic scattering orders up to P8 and angular quadrature orders up to S16. Also, multi-group gamma cross-section library required for this numerical transport simulation is generated in a discrete appropriate form. Finally, photon pulse height distributions are indirectly calculated by deterministic methods that approvingly compare with those from Monte Carlo based codes namely MCNPX and FLUKA.