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<p><a href="page.php?w=cosmic_ray">cosmic rays</a>). An original ionisation event produces an ion pair; the positive <a href="page.php?w=ion">ion</a> accelerates towards the <a href="page.php?w=cathode">cathode</a> while the free electron accelerates towards the <a href="page.php?w=anode">anode</a>. If the electric field is strong enough, then the free electron can gain sufficient velocity (energy) to liberate another electron when it next collides with a molecule. The two free electrons then travel towards the anode and gain sufficient energy from</p><p>
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