Fission , primarily `` fast '' fission of the natural uranium tamper surrounding Surrounding the fusion capsule , greatly increases Cause_change_of_position_on_a_scale the yield of thermonuclear devices , and constitutes the great majority of the fallout , as nuclear fusion is a relatively clean reaction .

When the community was hit Attack by uranium mine closures in the 1990s , the complex gradually refocused , hosting multiple services Supply , such as a library , constituency offices , and public health offices .

On August 6 , one of the modified Change B-29s dropped Motion_directional a uranium gun-type bomb ( `` Little Boy '' ) on Hiroshima .