 Events in the early 1980s included Sandra Day O'Connor becoming the first woman named to the U.S. Supreme Court and the 1982 Falklands War between England and Argentina. Two years later, the Soviet Union boycotted the 1984 Los Angeles Olympic Games. As IBM unveiled the PC Convertible, the world's first laptop computer in 1986, the Chernobyl nuclear power plant disaster in the Soviet Union released large quantities of radioactive particles into the atmosphere. Much of this radioactive material was spread over the Western Soviet Union and Europe. This disaster has been considered the worst nuclear power plant accident in history in terms of its high cost and number of casualties. During the accident itself, 31 people died and the long term effects such as cancers are still being investigated. By the end of the decade, the International Commission on Radiological Protection issued Publication 60, an update to its basic recommendations last issued in 1977. Based on new biological information, Publication 60 revised radiation dose limits for both radiation workers and members of the public exposed to ionizing radiation.