Radioactive isotope. Radioactive isotope, also called radioisotope, radionuclide, or radioactive nuclide, any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays. 1  A brief treatment of radioactive isotopes follows.
BLM sympathizer Markeith Loyd (Orlando cop killer) caught. Posted on 17 January 2017. BLM sympathizer Markeith Loyd (Orlando cop killer) has finally been caught. Living about five miles away from where he killed one cop and was indirectly responsible for a second copâs it took this long to find the gangbanger thug.
As officials offered new details about the worst mass shooting in American history, which left 49 people dead and 53 wounded, Chief John Mina of the Orlando Police Department said that the gunman, Omar Mateen, 29, told police negotiators â falsely, they later discovered â that he had explosives and accomplices at Pulse nightclub.