RARE EARTH STORAGE MEDIUM PARTICLES, RARE EARTH STORAGE MEDIUM PARTICLE GROUP, AND COLD HEAD USING

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Provided are rare earth storage medium particles and a rare earth storage medium particle group having long-term high reliability, a cold head using these, a superconducting magnet, an inspection device, and a cryopump. Rare earth storage medium particles containing rare earth elements in the constituent components, wherein a peak indicating a carbon component is detected in the surface region by X-ray photoelectron spectroscopic analysis.