haha nice job!
I had been playing with Am-241 sometime ago
Personally I just feel like it is a bit like "cheating"(haha) if use those tritium tube. I had been thinking if possible to directly convert the radioactivity directly to electrical energy but seems not that trivial.
Anyway, I had been following this channel for a long time and here is one similar demonostration like yours which I think is quite impressive as yours too ~ Nice work and enjoy :D