Lucas Beveridge is talking about something he and Sam Piper did for Atomos Nuclear and Space. Suppose we only shipped one reactor to a HEO. That reactor hands over neutrons to some neutral metal... which then becomes radioactive, including in the gamma spectrum - one per mission. This transfers "enthalpy": energy to tungsten plates. The plate then delivers those joules over time, in kilowatts. I hear beryllium too.
Here's how it was tested; here's what was tested.
At HEO - as in, GEO or higher - is way too high up for Earthlings to care. You can fuel up a lot of space tuggery. Take Tory Bruno's Blue Ring, which needs one tonne of xenon for four of payload. That reactor looks like it would in fact deliver the 5.5 kW needed to propel to Gateway's lunar NRHO. To get a mission rolling "for weeks or months", Beveridge prescribes Scandium-46 with its low 84-hour halflife. Maybe tugs; maybe Venus injection. Sc-46 is allowed to deorbit after three years.
The test used Manganese-56 which decays in 2.6 hours. This can deorbit rather sooner. Maybe use the Mn-56 for high-thrust tugs between HEOs and be done with it. Like if you just want to hit the Spaceline cable at the 80 Mm this blog has promised.
Various enthalphy-rockets have been recommended for station-keeping. Further: with this much power in a small package, we could go up to Martian landers. Solar flybys with Oberth?
For longer missions, he's talking Cobalt-60 at its 5.27 year halflife. We might not want this in Earth orbit... ever. Beveridge is suggesting this for a Uranus orbiter, or series of orbiters. First it has to get there but we can probably do that with a Starship. And/or with a fusion-driven ship launching off Deimos. This one burning constantly might also do without radiators, since this whole setup is the radiator.
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