So two questions, or 1. Depending on how you look at it: 1.) The Trinity Test Site: is that where the device was exploded? Or just the general area? Because it looks decent enough, for a nuclear detonation. If so, is it safe for people to be in the area? It has to be radiated, to some degree, right? 2.) Reading the wikipedia page for Trinitite you provided, some people make jewelry out this material. Is that safe? I know I sound like a broken record, but I always thought any type of radiation was bad and should be avoided.
Edit: looking at my post, I just realized I asked multiple questions. ::facepalm:: My bad.