Or how about the nuclear alternative that GE started development of? (1950s)
The idea was to use a heat exchanger in the combustion chamber.
Think I'm joking? Think again.
I believe it was called the XB-211 - similar to another engine I can think of.
Just imagine, aircraft able to stay in the air for weeks at a time - bliss. As long as you have life in the turbine blades etc, you can stay up. OK, so the shielding might be a tad heavy, and "heavy landings" might cause a bit of fall-out, but that's a real nuclear deterrent.