Australia has been nuked 12 times.
The United Kingdom conducted
12 major nuclear weapons tests in Australia between 1952 and 1957. These explosions occurred at the Montebello Islands, Emu Field and Maralinga.
https://edition.cnn.com/2018/10/14/australia/australia-uk-nuclear-tests-annivers...Australia is still dealing with the legacy of the UK's nuclear bomb tests, 65 years on
By James Griffiths, CNN
Updated 0016 GMT (0816 HKT) October 15, 2018
"Ultimately, they settled on Australia, which had many benefits," said Elizabeth Tynan, author of "Atomic Thunder: The Maralinga story," a book about the tests. These includes a sympathetic, compliant government under the recently elected Anglophile Prime Minister Robert Menzies, and wide open spaces in which to carry out the detonations themselves.
In September 1950, British leader Clement Attlee sent Menzies a secret message asking whether his government "would be prepared in principle to agree that the first United Kingdom atomic weapon should be tested in Australian territory."
According to a later Australian Royal Commission investigation, Menzies "immediately agreed to the proposal," without consulting any of his cabinet colleagues or the Australian parliament. Indeed, until weeks before the first test was carried out, only three government ministers knew about it.
Menzies' enthusiasm for the British bomb "wasn't all sycophantism, it wasn't all sucking up to his colonial masters," said Tynan, though this was definitely a factor. The Australian leader also saw in the atomic age an advantage for his country, which was one of the few to have large stocks of uranium, a previously largely unwanted material.
The UK's first atomic bomb was detonated in the waters off the Montebello Islands, a small archipelago in north western Australia, in the early hours of October 3, 1952, officially making London the third member of the nuclear club, after the US and the Soviet Union.
Unlike the Montebello test, which went off largely as planned, the 9.1 kiloton Totem I sent a cloud of debris and smoke some 15,000 feet (4,500 meters) into the air, spreading fallout far higher and farther than originally expected.
The Royal Commission later found the test was carried out in inappropriate wind conditions and without proper consideration for people living nearby, examples of the often
staggering lack of care taken by British officials overseeing the nuclear program, who frequently ignored or did not bother to seek out vital information about the potential effects of their tests on the host country.