Reply To: YouTube Focus Fusion Video

[Brian H]

jamesr wrote:

That was my understanding- a metal or plastic water tank containing a 1m (distilled?)water shield, covered by 10cm of boron (type unspecified), covered by 2cm of lead or boronated polyethylene. We discussed this with Eric and Rematog around March of ’09 iirc. Searching the site for boronated polyethylene may bring up the thread.

Sounds familiar… I found this reference from Eric from way back in 2006 https://focusfusion.org/index.php/forums/viewthread/91/#346

Excellent find. Slightly edited for spelling, etc., here’s the relevant excerpt:

The main shielding is for the residual neutrons—about 80-100 cm of water and 20 cm of boron-10 with a small, few-cm layer of lead to absorb the gammas. None of the x-rays will get through that.
…
5) What are the approximate dimensions of the proposed reactor?

Reactor plus shielding is 2 meters across but the whole thing, including capacitor bank may be more like 3x2x2 meters.