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thulium-170

chemical isotope

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thulium

  • thulium
    In thulium

    …neutrons, natural thulium becomes radioactive thulium-170 (128.6-day half-life), which ejects soft gamma radiation with wavelength commensurate with laboratory hard X-ray sources. Only one allotropic (structural) form is known for thulium. The element adopts a close-packed hexagonal structure with a = 3.5375 Å and c = 5.5540 Å at room temperature.

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