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Bomb Power Indicator
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Bomb Power Indicator : ウィキペディア英語版
Bomb Power Indicator

Bomb Power Indicator known by the acronym BPI was a detection instrument, located at the twenty five British Royal Observer Corps controls and nearly 1,500 ROC underground monitoring posts, across the United Kingdom, during the Cold War that would have detected any nuclear explosions and measured the peak-overpressure of the blast waves.
==Overview==
The instruments, operated by volunteers, measured the level of peak-overpressure at the instrument's location. Once readings had been combined with information provided by the Ground Zero Indicators it would be possible to estimate the size of the nuclear explosion in megatons. Detailed BPI information was backed up by the automatic AWDREY readings.
The BPI was designed and built by the Atomic Weapons Establishment at Aldermaston. The design was tested for performance and accuracy using real nuclear explosions at the 1957 Kiritimati (or Christmas Island) nuclear weapons tests, after being mounted on board a ship. A number of BPIs were also tested in Australia during the Operation Buffalo series of nuclear tests, with units located at various distances from ground zero.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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