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Radiation detection techniques have important applications including prompt gamma neutron activation analysis (PGNAA), radiotherapy dose measurement, medical imaging and homeland security. Pulse height distribution is also a useful parameter in Radionuclide identification. Gamma ray spectroscopy analysis is a common technique in measuring of radiation field to identify the radioactive source.
Probabilistic methods are commonly used for numerical simulation of Pulse height distribution. In Monte Carlo methods, each history is individually tracked and details of interactions are available. Using the Monte Carlo methods for calculation of pulse height distribution leads to more real... 

In this thesis, we consider Compute and Forward schemes in relay assisted cooperative communication networks. The main problem associated with the compute and Forward scheme is the possible dependency of the relayed equations to the destination, which leads to the outage and thus the very low achievable rate. We propose several approaches to deal with this problem. In the first part of the thesis, we consider a cooperative network consisting of multi users, multi relays, and one common destination with no direct links between the users and the destination. We propose three strategies to lessen the aforementioned problem associated with the conventional compute and forward relaying scheme,...