p-Terphenyl-d14 is a fully deuterated derivative of p-terphenyl, primarily used in neutron detection and scintillation applications. It functions as a fluor in organic scintillators, where the deuterium labeling reduces proton background interference, enhances neutron sensitivity (via reactions like n + D → T + p), and minimizes signal overlap in radiation detection systems. Its aromatic structure and high thermal/chemical stability make it ideal for high-field environments and low-speed neutron detection in high-background radiation settings. It may also serve as a deuterated reference compound or additive in NMR spectroscopy for aromatic systems, providing a stable medium with minimal proton signals, though it is not typically used as a solvent due to its solid state.