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The Elephant's Foot is the nickname given to a large mass of corium and other materials formed underneath the Chernobyl Nuclear Power Plant, near Pripyat, Ukraine, during the Chernobyl disaster of April 1986, notable for its extreme radioactivity. It is named for its wrinkly appearance, evocative of the foot of an elephant. Discovered in December of the year of the disaster, it is located in a maintenance corridor below the remains of Reactor No. 4, though the visible "elephant's foot" is only a part of a larger mass. It is still an extremely radioactive object, though the danger has decreased over time due to the decay of its radioactive components. Origin The Elephant's Foot is a mass of black corium with many layers, resembling tree bark and glass. It was formed during the Chernobyl disaster in April 1986 from a lava-like mixture of molten core material that had escaped the reactor enclosure, materials from the reactor itself, and various structural components of the plant such as concrete and metal. The Foot was later discovered in December 1986. The Elephant's Foot is located in Room 217/2, 15 metres (49 ft) to the southeast of the ruined reactor and 6 metres (20 ft) below ground level. The material making up the Elephant's Foot had burnt through at least 2 metres (6.6 ft) of reinforced concrete, then flowed through pipes and fissures and down a hallway to reach its current location. Composition The Elephant's Foot is a solidified corium glass composed primarily of silicon dioxide, with traces of dissolved uranium, titanium, zirconium, magnesium and graphite. Over time, zircon crystals have started to form slowly within the mass as it cools, and crystalline uranium dioxide dendrites are growing quickly and breaking down repeatedly. Despite the distribution of uranium-bearing particles not being uniform, the radioactivity of the mass is evenly distributed. The mass was quite dense and unyielding to efforts to collect samples for analysis via a drill mounted on a remote-controlled trolley, and armor-piercing rounds fired from an AK-47 assault rifle were necessary to break off usable chunks. By June 1998, the outer layers had started turning to dust and the mass had started to crack, as the radioactive components were starting to disintegrate to a point where the structural integrity of the glass was failing. In 2021, the mass was described as having a consistency similar to sand. Radioactivity At the time of its discovery, about eight months after formation, radioactivity near the Elephant's Foot was approximately 8,000 to 10,000 roentgens, or 80 to 100 grays per hour, delivering a 50/50 lethal dose of radiation (4.5 grays) within five minutes. Since that time, the radiation intensity has declined significantly, and in 1996, the Elephant's Foot was briefly visited by the deputy director of the New Safe Confinement Project, Artur Korneyev, who took photographs using an automatic camera and a flashlight to illuminate the otherwise dark room. The Elephant's Foot is roughly 10% uranium by mass, which is an alpha emitter. While alpha radiation is ordinarily unable to penetrate the skin, it is the most damaging form of radiation when radioactive particles are inhaled or ingested, which has renewed concerns as samples of material from the meltdown (including the Elephant's Foot) turn to dust. Nevertheless, the corium still poses an external gamma radiation hazard due to the presence of fission products, mainly Cs-137. See also Chernobylite Trinitite Notes References . Discover the Henry Fountain popular books. Find the top 100 most popular Henry Fountain books.