Gadolinium‑157, a stable isotope with an exceptionally high neutron‑capture cross‑section, underpins critical applications in nuclear reactor control rods, advanced medical imaging, and oil‑field neutron logging. The Gadolinium‑157 market size was estimated at USD 71 million in 2025, and the growth outlook projects a CAGR of 5.8% through the 2026‑2033 forecast period, driven by expanding nuclear energy capacity, rising demand for high‑resolution imaging agents, and tightening regulations on neutron‑absorbing materials. Primary market scope encompasses isotope production, enrichment services, and downstream applications across energy, healthcare, and exploration sectors. North America currently commands the largest market share, while the Asia‑Pacific region is emerging as the fastest‑growing market due to aggressive nuclear power roll‑outs and increasing healthcare investment.