Precautions

Another benefit of a concrete monolithic dome is that 4 inches of concrete is a pretty good protection from the possible short term fallout from an exploded power plant. It would be a good idea to consider covering a 40 x 60 foot patch of ground with a poly plastic sheet and then covering it over with some rocks and a layer of dirt. You may need till-able soil and soil with radiation fallout on it may not be really worthwhile, i.e. contaminated.

Offered by Eric.