So I'm looking for this book that is about a scientist that gives you a shrink belt to chase a thief that has stolen government secrets from a Particle Accelerator/experimental lab. You can choose what to do in the story and there are several bad ends, like the thief turning himself into antimatter in the accelerator and blowing up the whole place or shrinking so small an amoeba eats you. It's not a CYOA book afaik because I haven't found any that fit the storyline. I read this years ago and think it might just be lost media at this point, over the years I've tried looking for it to no avail.