world rank. 1639. Overview. Founded in 1970, Universidade Estadual de Londrina (State University of Londrina) is a non-profit public higher education institution located in the the urban setting of the small city of Londrina (population range of 250,000-499,999 inhabitants), Parana.
Scientists have hotly debated whether the bursts are cosmological -- from the edge of the universe -- or galactic, from within the Milky Way. Now we have strong evidence that most gamma ray bursts come from within our galaxy, Lamb said. The 25-year-old question about where the bursts originate may finally be answered.. Lamb said the evidence that the bursts are galactic in origin was a surprise, and certainly not something I was confident of initially..
Potassium gives off only a gamma ray. The other elements give off a gamma ray, then decay to other elements called daughters, which, because they are still radioactive, give off other gamma rays, and so on. This gives rise to the pattern of gamma ray energies in Fig. 1. These are called spectra of the elements and are as unique as fingerprints. It is not surprising that the brightness of a light pulse produced in a scintillator crystal is proportional to the energy of the gamma ray.