Beyond application, the market taxonomy distinguishes three principal types of neutron source generators, each with distinct technology pathways and cost structures. Radioisotope‑based generators, dominated by ^252Cf spontaneous fission sources, capture roughly 31 % of market revenue due to their simplicity, low power consumption, and suitability for portable field deployments. Accelerator‑driven generators—including deuterium‑tritium (D‑T) tube‑type units and linear accelerator (linac) systems—command the largest portion at 49 %, driven by their ability to modulate neutron output, achieve higher fluxes, and comply with regulatory limits on radioactive material handling. Fusion‑based generators, such as inertial confinement or magnetic confinement prototypes, remain niche, representing about 8 % of sales, but they are projected to expand as high‑energy neutron applications mature. The residual 12 % comprises hybrid solutions that integrate radioisotope seeds with accelerator boosters. Understanding the distribution of these types is essential for forecasting R&D expenditures, supply‑chain requirements, and long‑term market growth within the Neutron Source Generator segmentation framework.