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The "field" from this amount of Radium should be of no problem because its well shielded by earth. The problem lies if it gets outside of its containment then it is of concern.
Great photo. of the 60's or 70's. Unfortunately those times are gone probably forever. Notice how well dressed all the people on the street are unlike today? I always thought that building was well kept but look at the upper floor level.
I have watched the excellent video of "1990". In line with that subject is a book "Dominion" by C. J. Samson I don't know if it was made into a TV series etc but it would have made a great one. Also on this subject line is the movie/picture "V for Vendetta".
The raft/slab structure can handle a number of ground/soil conditions. Here in Canada where there is swamp or soft ground conditions they use the slab as 3 or 4 Ft. down its swampy therefore no basement.
I hate to rain on your parade but the cocencus of opinion on these big events Olympics, commonwealth and Fifa isthe host country,city, state etc at the end when everyone buggers off home is left with enormous debt and nearly useless infrastructure.