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Nuclear Weapons Are A Threat To All Beginning of Paper Ever since the first nuclear weapon was built in 1945, nuclear war has been a threat. The two major nuclear powers in the world today are the Soviet Union and the United States. If a war ever broke out between the two, which involved the use of nuclear weapons, the whole world wou .... Middle of Paper .... are sent out, which go on to split other nuclei. If this continues a process called a chain reaction will occur. When this happens a fission explosion is the result. To form a chain reaction, a certain amount of material is needed. This amount is known as the critical mass. If the amount is too small it is known as a subcritical mass. The critical mass of a material depends on its purity. The materials used in making fission weapons are uranium and plutonium. They are the only elements able to be used in making a fission weapon. Ther .... 863 words | 4 pages Subscription Length Price Join 30 days membership (recurring) $19.95 90 days membership (recurring) $39.95 180 days membership (non-recurring) $69.95