 The comparison is not quite perfect as, due to its surface burst location, "Ivy Mike" created a large amount of early fallout contamination.Historical above-ground nuclear weapon tests included 189 megatons of fission yield and caused average global radiation exposure per person peaking at in 1963, with a residual in modern times, superimposed upon other sources of exposure, primarily natural background radiation, which averages globally but varies greatly, such as in some high-altitude cities.Any comparison would be influenced by how population dosage is affected by detonation locations, with very remote sites preferred.