I am by no means well versed in nuclear power, but from my limited exposure I have gathered that a very large portion of nuclear energy (and antimatter) is expressed in high energy gamma radiation. All forms of electromagnetic radiation are expressed as photons, correct? Taking the concept of photovoltaic cells, which capture photons in the visible spectrum, can that not be applied to high energy gamma photons to capture some of that energy? I would imagine that significant damage would occur to the cells from the ionizing radiation. But from what i gather from the source of all accurate* knowledge (wikipedia), even non-photoelectric effect interactions would produce smaller (less energetic photons) that through enough iterations would be low enough in energy to be absorbed through the cells. Granted I know nothing of the engineering of such photovoltaic cells, but the concept itself seems to lend itself rather well. Would this be feasible in anyway whatsoever?