Solar panels (photovoltaic modules) are intended for transformation of a sunlight to electric energy and are one of kinds of ecologically pure renewed energy sources. Systems of solar panels have doubtless advantages before traditional energy sources.

PWO crystal (lead tungstate crystal) are scintillator, i.e. crystal which can detect of ionizing radiation. Scintillation elements is used in the electromagnetic calorimeter which create by CERN (European Organization for Nuclear Research).