Definition

1. Noun:
   • A synthetic, radioactive, metallic chemical element with the symbol Tc and atomic number 43. It is a silvery-gray metal that does not occur naturally on Earth in significant quantities and is primarily produced as a byproduct of nuclear fission.

Usage Examples

• Noun:
  • The medical scan uses a radioactive isotope of technetium to image bones.
  • Technetium was the first element to be produced artificially.
  • Scientists study the properties of technetium in laboratory settings.

Advanced Usage

• "Technetium-99m": This is a metastable nuclear isomer of technetium-99, widely used as a radioactive tracer in medical diagnostic procedures due to its ideal gamma-ray emission and short half-life.
  • Technetium-99m is the most commonly used medical radioisotope in the world.

Variants and Related Words

• Technetate (noun): A salt or ester of technetic acid, containing the anion TcO₄⁻.
  • Potassium pertechnetate is a common compound used in research.

Synonyms

• Element 43
• Tc (chemical symbol)

Notes on Meaning

The core meaning of technetium is defined by its status as an artificial element. Its primary significance lies in its applications, especially in nuclear medicine (via its isotope Tc-99m) and as a product of nuclear reactors. It is not a term with idiomatic or phrasal verb uses, as it is a specific scientific noun.

Noun

1. a crystalline metallic element not found in nature; occurs as one of the fission products of uranium