Gamma-Ray Imaging Gamma Ray - It is a parcel of electromagnetic energy emitted in the decay of certain subatomic particles and in the disintegration of radioactive atomic nuclei . Characteristics - Gamma rays are high-energy photons Gamma rays have high power of penetration Gamma rays travel at the speed of light Gamma photons have no mass Gamma photons have no electrical charge Imaging with Gamma Rays- 1. In Medical Field PET (Positron Emission Tomography) SPECT (Single-Photon Emission Computed Tomography) 2. In Astronomical Observations Gamma rays are emitted in universe by supernova explosions, regions around black holes, neutron stars etc. Source of Gamma Rays Gamma rays can be observed using telescopes such as F...