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<p>for rocks which have been exposed for between 10<sup>3</sup> and 10<sup>6</sup> years.</p>

<p><big>Cosmogenic radionuclide dating</big></p>
<p>The most common of these dating techniques is cosmogenic radionuclide dating. Earth is constantly bombarded with primary <a href="page.php?w=cosmic_ray">cosmic ray</a>s, high energy charged particles - mostly <a href="page.php?w=proton">proton</a>s and <a href="page.php?w=alpha_particle">alpha particle</a>s. These particles interact with atoms in atmospheric gases, producing a cascade of secondary particles that</p><p>
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