The U.S. atomic bomb survey team and Masao Tsuzuki and his colleagues from the University of Tokyo conducted a substantive survey of the atomic bomb survivors and the damage they suffered after being exposed to the atomic bomb on September 11, 1945, at Ohno Army Hospital (present-day Miyahama Onsen, Hatsukaichi City) in Hiroshima Prefecture. Masao Tsuzuki and others guided a Manhattan District survey team of the U.S. Army's atomic bomb survey team to Ohno Army Hospital and explained the damage and A-bomb diseases to the Hibakusha. On August 31, 1945, the Mainichi Shimbun published a report on the damage caused by other atomic bombs and the A-bomb diseases of the Hibakusha on August 31, 1945. It exposed the atrocity of the horrific atomic bombs dropped on Hiroshima and Nagasaki. Now, the medical community in Japan has come to investigate the truth of the atrocities from the standpoint of pathology. During the wartime period, the Hiroshima Army Hospital opened the first and second branches in Motomachi, and the other branches in Eba, Mitaki, and Ono, and in June 1945, in preparation for the battle for the mainland, a three-hospital system was established: Hiroshima Temporary First Army Hospital, Hiroshima Temporary Second Army Hospital, and Ono Army Hospital.
On September 19, the General Headquarters of the Allied Forces (GHQ) began censoring Japanese news reports and publications, and the Mainichi Shimbun officially published its coverage of the atomic bomb immediately after September 19, just before the GHQ banned the atomic bomb by censoring all materials. On September 17, the Makurazaki typhoon hit the Ono Army Hospital, killing about 156 people, according to a Kyoto University survey team. The Army Hospital was closed after the disaster, and all documentation of the damage was lost and abandoned. The incident at Kyoto University was not known to the public for a long time because the GHQ press code, under which the Asahi Shimbun criticized the U.S. for the atomic bombs, stopped the publication of newspapers on September 16 and 20.
Immediately after the atomic bombs were dropped on Hiroshima and Nagasaki and exploded, the damage caused by the atomic bombs and the reality of the deaths from the bombings were gradually made public by the Japanese mass media. Masao Tsuzuki and his team and the U.S. Army's atomic bomb survey team went to Hiroshima, and the U.S. Army took all the materials on atomic bomb sickness of the Hibakusha who were exposed to the atomic bombs back to the U.S. In addition, a press code was put in place on September 19, and the reality of the atomic bombings was sealed for a long time. This was a defeat for the medical community and the mass media in Japan. The Press Code for Japan ("Press Code") is a set of rules to control and censor newspapers and other news media under the Allied occupation of Japan after the end of the Pacific War, issued by the General Headquarters of the Supreme Commander of the Allied Powers (GHQ). On September 15, the Asahi Shimbun published an op-ed by Ichiro Hatoyama, who advocated that justice is power, saying that the use of atomic bombs and the killing of innocent people in the U.S. was no more a violation of international law or a war crime than the attack on a hospital ship or the use of poison gas.
