The bulk of the radiation would, I think, be bremsstahlung x-rays. So if you’re running at say +/-20kV on the power supply, then electrons accelerated upto 40keV can emmit a photon of upto that energy when they scatter off an ion. Of course this is a lot softer than the other sources if you actually get any nuclear reactions, and so mostly won’t penetrate the chamber walls. But they shouldn’t be ignored as they could give you a serious dose if you were standing in front of the camera windows.
You should build in interlocks – so you can only turn it on from outside the room/behind concrete wall.
