NUCLEAR 'SNIFFERS'

摘要

The US conducted the world's first nucler explosion in 1945 and the Soviet Union followed suit four years later. During the subsequent arms race in the 1950s, both countries conducted large numbers of nuclear weapons tests, with atomic and hydrogen bombs being exploded in the atmosphere, with some carried out near the tropopause at 33,000-46,000ft. The enormous heat from these blasts caused the byproducts of radioactive fission to rise to high altitudes in the form of particles and spread around the globe.