This article ceased to interest me, I found it to be generically creepy, and execution needs improvement. Have you tried any of the resources DJ supplied? They're extremely helpful. Here are some specific things I'd personally change in the article as it is right now: (Notice my karma is low so if I say something wrong someone please correct me)
-Are these two armed guards over, or under the 50 meter radius?
-Are he armed guards supposed to combat the SCP in the event of a containment breach? Or keep others out of the radius? If they are meant to combat Bob then how? If they are keeping people out why not just put up a different obstacle like keeping him in a part of a building where no one can get close?
-What is the Foundation's reaction to a breach?
-Are there small objects placed in his cell?
-White as in caucasian or do you mean actually white?
-Mechanical in what way?
-If I were in a cell I'd probably look at the cameras too since it seems there's not much to look at. Is he looking at hidden cameras? Is he identifying the personnel watching him?
-"Messily" is probably not the best adjective in a scientific article.
-Subject is used to describe your SCP at least 3 times. This is not the right terminology for subject. This is however, a common mistake. Just note that "SPC" does not equal "Subject"
Lastly: You know exactly what your SCP does and that's great! Unfortunately the idea is somewhat generic. HOWEVER! Any SCP can work through execution. Maybe give the SCP a character that's less rigid to responsive action and/or provide a backstory to it. A well thought-out containment is a definite must. After all, it's the first thing you read, and even the most generic SCP can prosper with a good, interesting containment.
Sorry for calling your article generic. Frankly I think it just needs work.