In this paper

gamma-ray distributions from nuclear weapon parts of different shapes are simulated.The gamma-rays from a cylinder nuclear part have axis-symmetry distribution

while the gamma-rays from prism nuclear parts are of asymmetry distribution.The quadra-and penta-prism distributions differ obviously from that of the cylinder.However

the asymmetry of hexa-

octo-and dodeca-prism reduces gradually to approach to the symmetry distribution of the cylinder.