Was Stalin surprised by Truman when told about atomic bomb?

At the close of the Potsdam Conference involving the Big Three on July 24, 1945 U.S. President Harry S. Truman told the Soviet Premier Joseph Stalin that the U.S. has successfully developed a new weapon. Truman later said Stalin was not that surprised.

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others  

c. businesses/firms & government