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The ground has small amounts of radioactive elements which means they emitt alpha rays, beta rays & gamma rays. Some locations have more then others but there's a little just about everywhere. There are also radiation particles that come from outer space (cosmic rays). All of these radiations are called the "background" radiation and can be counted with a Geiger counter. When a scientist is trying to do an experiment in radioactivity the background radiation is called radiation noise because its really not wanted and can interfere with the experiment.

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16y ago

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