Roentgen

/'rɔntjən/ Cách viết khác : (röntgen) /'rɔntjən/
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Definition
  1. Noun:
    • A unit of measurement for ionizing radiation exposure: The "roentgen" (symbol: R) is a unit used to quantify the amount of X-ray or gamma radiation exposure. It is defined as the dose that will produce one electrostatic unit of electricity in one cubic centimeter of dry air under standard conditions.
    • A surname, specifically of Wilhelm Conrad Röntgen: The word is also used to refer to the German physicist who discovered X-rays in 1895.
Examples of Usage
  • Noun (Unit of Measurement):
    • The patient received a dose of 2 roentgens during the diagnostic procedure.
    • The safety limit for occupational exposure is measured in milliroentgens per hour.
  • Noun (Person):
    • Roentgen was awarded the first Nobel Prize in Physics in 1901 for his discovery.
Advanced Usage
  • "Roentgen equivalent man (rem)": A unit of equivalent dose that accounts for the biological effects of different types of radiation. It is related to but distinct from the roentgen.
    • The radiation dose was reported as 5 rem, which considers the type of radiation, unlike the roentgen.
  • "Roentgen ray": An older, now largely historical, term for an X-ray.
    • Early medical texts often refer to X-ray images as roentgen rays.
Variants and Related Words
  • Röntgen: The original German spelling of the physicist's surname and the unit.
    • Wilhelm Conrad Röntgen made his discovery in 1895.
  • Roentgenology (n): The branch of medicine concerned with the diagnostic use of X-rays.
    • He specialized in roentgenology at the hospital.
  • Roentgenogram (n): A technical term for an X-ray photograph or image.
    • The doctor examined the chest roentgenogram.
Synonyms
  • R unit: An informal synonym for the roentgen unit.
  • Exposure unit: A general term for which the roentgen is a specific type.
Related Phrases
  • Roentgen per hour (R/h): A unit expressing a rate of radiation exposure.
    • The geiger counter showed a reading of 10 roentgens per hour.
Related Idioms

(This word is a scientific term and surname; it is not commonly used in idiomatic expressions.)

Noun
  1. German physicist who discovered x-rays and developed roentgenography (1845-1923)
  2. a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

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