What advice did Bohr give to the United States government after the first atomic bomb test in 1945?

What did Bhor say what did the Government say back? What is a good web site to look at on this topic?

Niels Bohr, letter to President Franklin D. Roosevelt (3rd July, 1944)

A weapon of an unparalleled power is being created which will completely change all future conditions of warfare. Unless some agreement about the control of the use of the new active materials can be obtained in due time, any temporary advantage, however great, may be outweighed by a perpetual menace to human security. An initiative, aiming at forestalling a fateful competition, should serve to uproot any cause of distrust between the powers of whose harmonious collaboration the fate of coming generations will depend.

In May, 1940, Germany invaded Denmark, the home of Niels Bohr, the world's leading expert on atomic research. It was feared that he would be forced to work for Nazi Germany. With the help of the British Secret Service he escaped to Sweden before being moving to the United States.

In 1942 the Manhattan Engineer Project was set up in the United States under the command of Brigadier General Leslie Groves. Scientists recruited to produce an atom bomb included Robert Oppenheimer (USA), David Bohm (USA), Leo Szilard (Hungary), Eugene Wigner (Hungary), Rudolf Peierls (Germany), Otto Frisch (Germany), Felix Bloch (Switzerland), Niels Bohr (Denmark), James Franck (Germany), James Chadwick (Britain), Emilio Segre (Italy), Enrico Fermi (Italy), Klaus Fuchs (Germany) and Edward Teller (Hungary).

Winston Churchill and Franklin D. Roosevelt were deeply concerned about the possibility that Germany would produce the atom bomb before the allies. At a conference held in Quebec in August, 1943, it was decided to try and disrupt the German nuclear programme.

Bohr returned to the U.S. in June and told Frankfurter of his failed meeting with Churchill. Frankfurter in turn spoke to FDR. Now the President asked to meet with Bohr.

Bohr's Aug. 26, 1944 meeting with Roosevelt was just the opposite of his meeting with Churchill. According to Bohr's son,

"Roosevelt agreed that an approach to the Soviet Union of the kind suggested [by Bohr] must be tried... Roosevelt said [in regard to Churchill's disagreement with Bohr's ideas] ...he thought that Churchill would eventually come around to sharing his point of view in this matter. He would discuss the problems with Churchill at their forthcoming meeting and hoped to see my father soon afterwards" (Aage Bohr in Rozental, pg. 206-207).

But when Roosevelt and Churchill met on Sept. 18, it was Roosevelt who agreed to Churchill's views on the matter. And to top that off, they decided that Bohr should be investigated and "steps taken to ensure that he is responsible for no leakage of information, particularly to the Russians". (Sherwin, pg. 109-110, 284).

Bohr eventually surmised that nothing good had come of his meeting with Roosevelt. He made one final attempt, via letter, to influence FDR. But before the letter could be delivered, Roosevelt died. Bohr gave the letter to Vannevar Bush, who had been Roosevelt's main science advisor. In June 1945 Bohr left the United States (Aage Bohr in Rozental, pg. 209-210).

During World War II Bohr did not argue against using the atomic bomb, unlike fellow Manhattan Project physicist Leo Szilard. Instead, he stayed focused on his message of international control and scientific openness. But after the atomic bomb was used on Japan Bohr told friends, "The frightening thing was... that it was not necessary at all" (Niels Blaedel, Harmony and Unity: The Life of Niels Bohr, pg. 233). British nuclear historian Margaret Gowing wrote that Bohr's son Aage said his father "privately deplored the spirit in which the bomb had been used" (Gowing in French and Kennedy, pg. 275).

Bohr continued to work for international control of nuclear weapons until his death in 1962.

On 6th August 1945, a B29 bomber dropped an atom bomb on Hiroshima. It has been estimated that over the years around 200,000 people have died as a result of this bomb being dropped. Japan did not surrender immediately and a second bomb was dropped on Nagasaki three days later. On 10th August the Japanese surrendered. The Second World War was over.

Actually, he gave his advice almost a year BEFORE the first atom bomb test. That test was on July 16, 1945.

"August 1944: Bohr and Roosevelt Talk. Bohr advises President Roosevelt that atomic energy should be developed with close international cooperation, or an arms race will result. His advice is ignored"

For documentation, see the timeline at the source below, which also has many other facts about Niels Bohr.