Uranium ore support a neutron-mediated chain reaction). Uranium, thorium, and potassium are the main elements contributing to natural terrestrial radioactivity. Uranium has the highest atomic weight of the naturally occurring elements and is approximately 70% denser than lead, but not as dense as tungsten, gold, platinum, iridium, or osmium. It is always found combined with other elements. Along with all elements having atomic weights higher than that of iron, it is only naturally formed in supernova explosions. The primary uranium ore mineral is uraninite (UO) (previously known as pitchblende). A range of other uranium minerals can be found in various deposits. These
Galena, Alaska The City of Galena is incorporated as a first-class city, governed by a city council. The city's mayor is Jon Korta. The Louden Tribal Council is elected to represent the local Athabascan Native community. The council's tribal chief is Jenny Pelkola. The City of Galena operated a full-time police department. There is an Alaska State Troopers post in Galena with two troopers and a trooper-pilot. Galena has a volunteer Rescue Squad composed of Alaska Emergency Trauma Technicians (ETT) and Emergency Medical Technicians (EMT), and a volunteer fire department which recently received new advanced firefighting apparatus from the U.S. Air Force