This helmet is part of the  Exoskeleton armour appearing in the open world first-person shooter video games S.T.A.L.K.E.R.: Shadow of Chernobyl, S.T.A.L.K.E.R.: Clear Sky and S.T.A.L.K.E.R.: Call of Pripyat.
S.T.A.L.K.E.R. Papercraft - Exoskeleton Helmet

The Svarog Detector from the S.T.A.L.K.E.R.: Call of Pripyat game is a prototype anomalous and artifact detector. It is the most advanced detector in the Zone.

STALKER Papercraft - Svarog Detector