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This symbol of radioactivity is internationally recognized.

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Northeast of San Francisco, California, on 5 August 1950, a United States Air Force Boeing B-29 Superfortress bomber carrying a Mark 4 nuclear bomb crashed shortly after takeoff from Fairfield-Suisun Air Force Base with 20 men on board. Twelve men were killed in the crash, including the commander of the 9th Bombardment Wing, Brigadier General Robert F. Travis, and another seven were killed on the ground when the aircraft exploded. The base was later renamed for Travis. (Full article...)

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Implosion nuclear weapon design3.gif
Credit: Original svg images are made by Fastfission, and animated by User:was a bee. 元の一連のsvg画像はFastfissionさんの手によるものです。私User:was a beeがGiamというフリーウェアで、それら一連の画像をGIFアニメにしました。
Animated explanation of implosion design.GIF アニメによる爆縮レンズ構造の説明。

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Slotin Los Alamos.jpg
Louis Alexander Slotin (1 December 1910 – 30 May 1946) was a Canadian physicist and chemist who took part in the Manhattan Project. Born and raised in the North End of Winnipeg, Manitoba, Slotin earned both his Bachelor of Science and Master of Science degrees from the University of Manitoba, before obtaining his doctorate in physical chemistry at King's College London in 1936. Afterwards, he joined the University of Chicago as a research associate to help design a cyclotron.

In 1942, Slotin was invited to participate in the Manhattan Project, and subsequently performed experiments with uranium and plutonium cores to determine their critical mass values. After World War II he continued his research at Los Alamos National Laboratory in New Mexico. On 21 May 1946, he accidentally began a fission reaction which released a burst of hard radiation. He was rushed to the hospital and died nine days later on 30 May. Slotin had become the victim of the second criticality accident in history following Harry Daghlian, who had been fatally exposed to radiation by the same "demon core" that killed Slotin.

Slotin was hailed as a hero by the United States government for reacting quickly enough to prevent the deaths of his colleagues. However, some physicists argue that Slotin's behavior preceding the accident was reckless and that his death was preventable. The accident and its aftermath have been dramatized in several fictional and non-fiction accounts. (Full article...)

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25 April 2022 –
Former Iranian MP Ali Motahari says the Iranian nuclear program initially aimed for a secret nuclear weapon and nuclear deterrence. (Iran International)

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