Comment by gus_massa
21 hours ago
In this case they are using 22Na that produces positrons. A quick search says that they cost like $50-$300. (I guess I'm in yet another list now.) I used one in the physic lab a few years ago. They are good enough to get a few blips in a Geiger counter or something similar.
I agree that if someone wants to make enough antiprotons and positrons to make enough antimater to power a rocket, the cost is prohibitive and there is absolutely no hope to make it cost efficient.
They really missed out on a chance to go with 'negatrons' instead of antiprotons.
That would too easily get confused with positrons (anti-electrons).
Or even "notorp". Notorps could have been a thing.