[BearCub]

Not very, as the reactions are only able to be sustained under intense pressure and temperatures exceeding 10 million degrees C, all the while being contained by massive magnetic fields.

Isn't fusion much cleaner too? I think its byproducts aren't radioactive?

[rednesss]

Ehhh, well the containment vessel becomes highly radioactive due to neutron bombardment. Most reactions being researched are some combination of Deuterium and Tritium yielding an energetic Helium-4 atom and a very energetic neutron. Some are looking at Helium-3 and Deuterium.

[coloradan]

Tritium is one of the byproducts and it’s smoking hot (~12 yr half-life) but it’s valuable and would be recycled and consumed. This is in addition to the containment vessel being made radioactive by neutron activation, as already pointed out.