level. The rate of muons arriving at the surface of the Earth is such that about one per second passes through a volume the size of a person's head. Together with natural local radioactivity, these muons are a significant cause of the ground level atmospheric ionisation that first attracted the attention of scientists, leading to the eventual discovery of the primary cosmic rays arriving from beyond our atmosphere.

Energy

Cosmic rays attract great interest practically, due to the damage they inflict on microelectronics and life

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