Chernobyl - Schmootography

I've read that the generic tours that most people go on advise tourists to stay off the moss because it's highly radioactive. It is slightly higher on moss than on asphalt, but what is most interesting is how aggressive it is. Moss grows seemingly spontaneously on the ground, just like The Blob. It dots the pavement and slowly eats everything it encounters: twigs, branches, even man-made debris.