Regarding heavy water separation, the BS article says:<p>&gt; All the water in the world contains light water H20, heavy water D20 and very heavy water T20. ... The thing we need to know is that in every 5 liters of tap water there
is 1 cc (cubic centimeter) of heavy water. Now heavy water is 17%
heavier that light water. ..<p>That leaves out HDO, or semi-heavy water. Quoting now from <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Heavy_water#Semiheavy_water" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Heavy_water#Semiheavy_water</a>:<p>&gt; In normal water, about 1 molecule in 3,200 is HDO (one hydrogen in 6,400 is in the form of D), and heavy water molecules (D2O) only occur in a proportion of about 1 molecule in 41 million (i.e. one in 6,4002). Thus semiheavy water molecules are far more common than &quot;pure&quot; (homoisotopic) heavy water molecules.<p>The 1:5000 ratio (1cc in 5L) is much closer to the 1:3200 ratio for semi-heavy water, not the 1:41 million for D20.<p>The BS article also says:<p>&gt; [Heavy water] is considered a munition so you can not just go and and buy some without all kinds of legal documentation and permits<p>United Nuclear says there are no restriction. See <a href="http:&#x2F;&#x2F;unitednuclear.com&#x2F;index.php?main_page=product_info&amp;cPath=16_17_69&amp;products_id=135&amp;zenid=54e1ed0c477416c600a4dd7dba62c247" rel="nofollow">http:&#x2F;&#x2F;unitednuclear.com&#x2F;index.php?main_page=product_info&amp;cP...</a> . Also, a kilo costs $725.<p>Sigma-Aldrich sells it at <a href="http:&#x2F;&#x2F;www.sigmaaldrich.com&#x2F;catalog&#x2F;product&#x2F;aldrich&#x2F;151882?lang=en&amp;region=US" rel="nofollow">http:&#x2F;&#x2F;www.sigmaaldrich.com&#x2F;catalog&#x2F;product&#x2F;aldrich&#x2F;151882?l...</a> . 4 kilos @ 99+% pure costs about $4,000.