In the movie "Act of Valor", there is a scene showing Shabal inspecting suicide bomb vests in a factory. The vests are lined with ceramic ball bearings that function like a claymore mine when detonated. Christo claimed that they can evade metal detectors and are thin enough to be worn under any clothing without attracting attention.
Disclaimer: I am not trying to make a bomb here.
I am curious if this is achievable. If not, what are the mechanics behind this that make it unsuitable?