Is the proposed use of Tritium practical in terms of supply? It's very expensive to produce. Also, there are significant impacts on space-borne science observ

Is the proposed use of Tritium practical in terms of supply? It's very expensive to produce. Also, there are significant impacts on space-borne science observation missions from nuclear reactors in space [1]. It would be a shame if the outcome was to render large sections of space opaque to observatories. [1] http://www.calpoly.edu/~dhafemei/SciAm_June_1991_NuclearPowerSpace.pdf http://www.calpoly.edu/~dhafemei/SciAm_June_1991_NuclearPowe...