thulium
Noun: 1. A chemical element: A soft, silvery-white, malleable metallic element belonging to the lanthanide series (rare earth group) on the periodic table. Its symbol is Tm and its atomic number is 69. 2. A material with specific applications: The isotope thulium-170 emits low-energy X-rays and is used in the production of small, portable X-ray machines for specialized applications.
Thulium is used primarily in technical and scientific contexts. * It is discussed as a chemical element with specific properties. * It is referenced as a material for specific technological or medical devices.
- Scientific Context: "Thulium is one of the least abundant rare earth elements."
- Technological Context: "The device utilizes a sealed source of radioactive thulium-170 to generate X-rays."
- Descriptive Context: "Pure thulium has a bright, silvery luster."
- In Geology: Thulium is described as occurring in minerals such as monazite, apatite, and xenotime, often alongside other rare earth elements.
- In Research: Due to its unique magnetic and spectral properties, thulium finds use in specialized solid-state lasers and superconductors.
- Thulium-170 (Tm-170): The specific radioactive isotope of thulium used in portable X-ray units.
- Thulia: An old or less common name for thulium(III) oxide (Tm₂O₃).
- Tm (Chemical symbol): The standard abbreviation for the element thulium.
- Rare earth metal / Lanthanide: Category to which thulium belongs. (Note: These are categorical terms, not direct synonyms for the element itself.)
Thulium does not have common idiomatic meanings or phrasal verbs. Its meaning is strictly confined to its identity as a chemical element.
-
a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime
Khám phá thêm
Các từ liên quan
Từ đồng nghĩa
Từ gần giống
