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<p>There are two important factors that characterize the performance of a cascade. The first is the <a href="page.php?w=separation_factor">separation factor</a>, which is a number greater than 1. The second is the number of required stages to get the desired purity.</p>

<p><big>Commercial materials</big></p>
<p>To date, large-scale commercial isotope separation of only three elements has occurred. In each case, the rarer of the two most common isotopes of an element has been concentrated for use in nuclear technology:<br/>
* <a href="page.php?w=Uranium">Uranium</a></p><p>
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