The calculations for it are a little weird and involve a rather strange unit called the SWU (separative work unit) and which is actually independent of the separation process, but it works out to be more like ~75% of the effort to go from natural -&gt; 20% enriched as it is to go from 20% -&gt; 95%.<p>You still need the raw mass though. To get enough weapons-grade uranium for a bomb (~15kg) from 20% enriched feed stock and discharging 2% enriched depleted uranium waste you need about 65kg of 20% enriched.<p>So 10kg (assuming it&#x27;s 20%) is definitely concerning, but it&#x27;s not enough to make a bomb.