1958 US–UK Mutual Defence Agreement as an atomic spy, caused the proposal to be dropped. The June 1951 defection of Donald Maclean, who had served as a British member of the Combined Policy Committee from January 1947 to August 1948, reinforced the Americans' distrust of British security arrangements. The first British atomic bomb was successfully tested in Operation Hurricane on 3 October 1952, but although it was more advanced than the American bombs of 1946, Britain was still several years behind in nuclear weapons technology. The United States conducted Ivy Mike, the first nuclear test of a true thermonuclear device (also known as a hydrogen
Atomic Mom Oakland, California. "Atomic Mom" is a documentary film written and directed by M.T Silvia, which focuses on the connection between two mothers that are each on a different end of the Hiroshima atomic warfare spectrum: Pauline Silvia, a United States Navy biologist, and one of the only women scientists present during the 1953 radiation detonations of Operation Upshot–Knothole at the then-Nevada Test Site, and Emiko Okada, a Japanese woman who was exposed to radiation from the Hiroshima nuclear bombings as a child. Atomic Mom also offers a comparison of the Hiroshima Peace Memorial Museum and the Atomic Testing Museum in