Artificial neural network (ANN) 1 Artificial neural network models 1 Classification 1 Depth determination 1 Electromagnetic Radiation 1 Electromagnetic wave scattering Gamma Rays 1 Gamma rays 1 High-density materials 1 MCNP 1 Material classification 1 Materials 1 Mean absolute error 1 Monte Carlo N particle code 1 Neural Networks 1 Neural networks 1 Optical Scattering 1 Specific materials 1 Stainless Steel 1 Stainless steel 1 Wood 1