There's 2 (stable) kinds of heavy water : deuterium and tritium. Deuterium is perfectly safe, and it's heavier. Nobody's ever drunk it in even tiny quantities though, so there could be surprises.
Tritium is only arguably stable though, and you definitely should not drink it. It's perfectly safe to swim in it though, just keep it outside your skin.
Drinking deuterium is going to be very expensive though, given the effort necessary to separate it. Poisoning someone with tritium is going to be more expensive than pouring molten platina over them though.
Any preference for the oxygen in the cubes ? O16, O17, or O18 ? O16 would be the "common man" oxygen. All three are safe. None of the other isotopes are stable enough to be produced in significant quantities.
Making heavy ice cubes out of H2O with the O17 is probably the cheapest "nuclear" way to produce heavy ice.
Order here:
http://www.sigmaaldrich.com/catalog/product/aldrich/151882
Cheaper than I would have thought.
Tritium is only arguably stable though, and you definitely should not drink it. It's perfectly safe to swim in it though, just keep it outside your skin.
Drinking deuterium is going to be very expensive though, given the effort necessary to separate it. Poisoning someone with tritium is going to be more expensive than pouring molten platina over them though.
Any preference for the oxygen in the cubes ? O16, O17, or O18 ? O16 would be the "common man" oxygen. All three are safe. None of the other isotopes are stable enough to be produced in significant quantities.
Making heavy ice cubes out of H2O with the O17 is probably the cheapest "nuclear" way to produce heavy ice.
Order here: http://www.sigmaaldrich.com/catalog/product/aldrich/151882
Cheaper than I would have thought.