There seems to be an inconsistency in the article. First it says the Dynamitron produces gamma rays:

> We can jump-start the fusion process using what is called a Dynamitron electron-beam accelerator. The electron beam hits a tantalum target and produces gamma rays, which then irradiate thumb-size vials containing titanium deuteride or erbium deuteride

But later it says:

> producing neutrons from a Dynamitron is energy intensive. There are other, lower energy methods of producing neutrons including using an isotopic neutron source

Is the input neutrons or gamma rays?