Roentgen (unit) in the context of Radiometer

👉 Roentgen (unit) in the context of Radiometer

A radiometer is an instrument for measuring radiometric quantities such as radiant flux (power), irradiance, or radiance. Definitions typically limit radiometry to optical radiation, but some definitions include other kinds of electromagnetic radiation. According to at least one instrument manufacturer, radiometers usually measure infrared radiation or ultraviolet radiation.

Microwave radiometers operate in the microwave wavelengths. A roentgenometer is a radiometer for measuring the intensity of X-rays or gamma radiation.

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Roentgen (unit) in the context of Rad (unit)

The rad is a unit of absorbed radiation dose, defined as 1 rad = 0.01 Gy = 0.01 J/kg. It was originally defined in CGS units in 1953 as the dose causing 100 ergs of energy to be absorbed by one gram of matter. The material absorbing the radiation can be human tissue, air, water, or any other substance.

It has been replaced by the gray (symbol Gy) in SI derived units. The rad is still used in the United States, although this is "strongly discouraged" in Chapter 5.2 of the Guide to the SI, which was written and published by the U.S. National Institute of Standards and Technology. However, the numerically equivalent SI unit submultiple, the centigray (symbol cGy), is widely used to report absorbed doses within radiotherapy. The roentgen, used to quantify the radiation exposure, may be related to the corresponding absorbed dose by use of the F-factor.

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Roentgen (unit) in the context of Radiometer

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👉 Roentgen (unit) in the context of Radiometer

Roentgen (unit) in the context of Rad (unit)