Hugh and Jim,
I was recently reading a book on nuclear reactors. I learned that iron can be used in concrete to provide neutron shielding. The iron slows the fast neutrons down to thermal levels that can be easily absorbed in the concrete. I also mine my own gold. As a byproduct of my mining, I have buckets of magnetite and hematite iron ore sand. The magnetite ore I sell to a local blacksmith for making steel. The hematite I’ve found no use for until now. I can use this black sand in place of silica sand in the concrete to provide neutron shielding for the temporary bomb shelter I’m building at my primary residence. Magnetite is Fe3O4 and is magnetic, and hematite is Fe2O3 and non-magnetic. Both comprise the black sand in the gold pan. So talk to your local gold miners about obtaining their black sands. – … Continue reading →
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