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An accurate rule of thumb, applicable in the time-period of days to a few weeks post-detonation which approximates the radioactive dose rate generated by the decay of the myriad of isotopes present in nuclear fallout, is the "7/10 rule". [133] [105] The rule states that for each 7-fold increase in time the dose rate drops by a factor of 10. [134]
A pencil detonator or time pencil is a time fuze designed to be connected to a detonator or short length of safety fuse. They are about the same size and shape as a pencil , hence the name. They were introduced during World War II and developed at Aston House , Hertfordshire , UK .
Time Change (minutes) Reason Clock 1947 7 23:53 0 The initial setting of the Doomsday Clock. 1949 3 23:57 −4 The Soviet Union tests its first atomic bomb, the RDS-1, starting the nuclear arms race. 1953 2 23:58 −1
A time bomb's timing mechanism may be professionally manufactured either separately or as part of the device, or it may be improvised from an ordinary household timer such as a wind-up alarm clock, wrist watch, digital kitchen timer, or notebook computer. The timer can be programmed to count up or count down (usually the latter; as the bomb ...
A delay-action bomb is an aerial bomb designed to explode some time after impact, with the bomb's fuzes set to delay the explosion for times ranging from very brief to several weeks. Short delays are used to allow the bomb to penetrate before exploding: "a delay action bomb striking the roof of a tall building will penetrate through several ...
A hollow plutonium pit was the original plan for the 1945 Fat Man bomb, but there was not enough time to develop and test the implosion system for it. A simpler solid-pit design was considered more reliable, given the time constraints, but it required a heavy U-238 tamper, a thick aluminium pusher, and three tons of high explosives. [citation ...
The 2004 Madrid train bombers, who killed 191 people and wounded 1,800, downloaded their bomb-making instructions from the internet. [24] The Canadian Saad Khalid admitted that he had downloaded bomb-making materials online in 2006, leading to the 2006 Toronto terrorism case. [25] British student Isa Ibrahim made a suicide vest bomb using ...
Soviet Union's 1990 series tests and detonations Name [note 2] Date time () Local time zone [note 3] [2] Location [note 4] Elevation + height [note 5] Delivery, [note 6] Purpose [note 7]