The Focus Fusion Society › Forums › Dense Plasma Focus (DPF) Science and Applications › More news, please › Reply To: General thought on old coal mines.
Aeronaut wrote: Yep, Jimmy, we’re both talking about the X-ray converter’s thousands of layers being the onion.
Thought so. I just think it’s called the onion due to its “bulb” shape. You think it’s because of the layers. We may well both be right.