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<p>showers or accelerators.Fast neutrons are produced by nuclear processes:<br/>
*<a href="page.php?w=Nuclear_fission">Nuclear fission</a>: thermal fission of  produces neutrons with a mean energy of 2&nbsp;MeV (200&nbsp;TJ/kg, i.e. 20,000&nbsp;km/s), which qualifies as "fast". However, the energy spectrum of these neutrons approximately follows a <a href="page.php?w=right-skewed">right-skewed</a> Watt distribution , with a range of 0 to about 17&nbsp;MeV, a <a href="page.php?w=median">median</a> of 1.6&nbsp;MeV, and a <a href="page.php?w=mode_%28statistics%29">mode</a></p><p>
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