operation crossroadsとは 意味・読み方・使い方

Operation Crossroads was a series of nuclear weapon tests conducted by the United States at Bikini Atoll in mid-1946. Its purpose was to investigate the effect of nuclear weapons on naval ships. The series consisted of two detonations, each with a yield of 23 kilotons: Able was detonated at an altitude of 520 feet (158 m) on July 1, 1946; Baker was detonated 90 feet (27 m) underwater on July 25, 1946. A third burst, Charlie, planned for 1947, was canceled primarily because of the Navy's inability to decontaminate the target ships after the Baker test. Crossroads Charlie was rescheduled as Operation Wigwam, a deep water shot conducted in 1955 off the California coast, thus framing the era of above ground nuclear testing.