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Unfortunately efforts to detect the one completely unambiguous "smoking gun" signature of a nuclear explosion, guaranteed to silence skeptics, namely radioactive fallout, failed. The U.S. government quickly launched a major effort to collect samples of the fallout cloud, but Air Force attempts to sample the fallout failed to enter the low-pressure air mass that had been over the detonation site at the time of the explosion (what the problem was I do not know). However Dr. Van Middlesworth detected low levels of iodine-131, a short-lived radioactive fission product, in sheep thyroids in the states of Victoria and Tasmania in western Australia soon after the event. Studies of wind patterns confirmed that fall-out from an explosion in the southern Inidian Ocean could have been carried there [Barnaby 1989; pg. 17].
It is impossible to assess whether Dieter Gerhard's account has any basis in fact. Some parts of his statements are interesting. The assertion that "The explosion was clean ..." suggests that it was a neutron bomb (which has been alleged before about this event) which is the only kind of low yield device to have reduced fallout. His statement that weather pattern changes caused its detection is interesting, since conclusive detection by this means has never been made public - the Australian fallout report (and a New Zealand one before it) were both subject to dispute. By his own admission of course, he had no direct connection with the project.