Garibian tried to develop methods that would help to resolve that problem. As a starting point of his research, he used results published in the article written by Ginzburg and Frank in 1946, where the theoretical existence of transition radiation was predicted. The new type of radiation appearing as a result of charged particle passing through the boundary between two layers of matter. In 1959, Garibyan discovered x-ray transition radiation, the intensity of which had a linear dependence on the Lorentz factor of the particle. Due to this feature, x-ray transition radiation received immediate practical implementation, as it made it possible to identify ultra-relativistic charged particles and to measure their energies.