persistent initiators is group of marketing association...

Jews, Muslims and Christians

The initiators in a group of white blood cells make u laugh

All are berylium-polonium neutron initiators for fission weapons

The polonium-beryllium "golf ball" neutron source internal initiators were designed in Los Alamos, New Mexico in the United States as part of the Manhattan Project. Later these were replaced by external electrically activated tritium particle accelerator neutron source initiators, also designed in the United States (note that similar devices are used in the oil industry for well testing).

Other countries with nuclear weapons arsenals independently created their own initiators.