Gamma Ray Filter (ガンマ線フィルター) is a magic that has been placed between the Neutron Barrier and the Fourth Phase Shift Field. Gamma Ray Filter was a type of magic that gathered the heat energy from gamma rays and expressed it as visible light.
Both Gamma Ray Filter and Neutron Barrier were classified as Dispersal-Type Magic. Dispersal-Type Magic was defined as magic that interfered with the movement and interaction of elementary and composite particles. Magic that manipulated gamma rays was categorized as Dispersal-Type Magic because the magic interfered with light particles, but on some level this was a later classification. These two magics were originally developed to neutralize the danger of nuclear fission weapons and the two of them were researched together in most situations. For ease of research, Gamma Ray Filter and Neutron Barrier were both categorized together.