Tube Alloys the features, science and idea behind the American Fat Man implosion-type nuclear weapon. He broke down the development tasks required to replicate it, identifying outstanding questions that required further research on nuclear weapons. On 3 October 1952, under the code-name "Operation Hurricane", the first British nuclear device was successfully detonated in the Monte Bello Islands off the west coast of Australia. The Sputnik crisis and the development of the British hydrogen bomb led to the Atomic Energy Act being amended in 1958, and to a resumption of the nuclear Special Relationship between America and Britain under the 1958 US–UK Mutual
Agathe (atomic test) "Vive La Bombe!". The French Defence Minister Pierre Messmer and other officials and civilians were present in the command post and were contaminated too (around >200 mSv). The millisievert (mSv) is commonly used to measure the effective dose in diagnostic medical procedures. See radiation poisoning for a more complete analysis of effects of various dosage levels. Data provided by the French Defense Ministry on January 2007. Agathe (atomic test) Agathe (aka Agate) was the name of the first French nuclear underground test. It was an atomic bomb detonated in the Hoggar mount (near In Ekker) of the then French Sahara