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radioactive thunderstorm

01.02.2001

Physicists from the University of Bologna (Italy), having installed radioactivity sensors on the Gran Sasso mountains, found that gamma radiation appears during thunderstorms. Moreover, two types of radiation were revealed.

The activity of one, with a photon energy of up to three megaelectron-volts, increased slowly, lasted for about an hour, and just as slowly fell. It is believed that aerosol radioactive particles hovering in the upper atmosphere fall to the ground with rain.

Another type of radiation is bursts with energies up to 10 megaelectronvolts lasting several minutes. Apparently, powerful electric fields accelerate free electrons present in the air, and when a fast electron collides with atmospheric atoms, so-called bremsstrahlung gamma radiation occurs.

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