It could be questioned for authenticity because
  of the handling of material with nuclear dust
  still measurable, then sitting down in such a
  place and biking off the site without going
  through some decontamination. If it is any
  thing like a dirty-bomb, by leaving on a bike
  it would seem possible to spread the dust.
  That was my guess; have not heard others.
  brian (interesting tour and great narrative.)

  brian thomas carroll: research-design-development
  architecture, education, electromagnetism
  http://www.electronetwork.org/bc/