Gray

Gray is a unit of measurement for absorbed radiation (radiation dose). One gray is equal to one joule of energy deposited in one kilogram of a material. The gray is used in the field of radiation therapy and is named after British physicist Louis Harold Gray.

Definition

The gray (symbol: Gy) is the SI unit of energy for the absorbed dose of radiation. It is defined as the absorption of one joule of radiation energy by one kilogram of matter. It is used to measure the amount of energy that ionizing radiation deposits in a unit mass of tissue.

Usage

The gray is used in the field of radiation therapy to measure the amount of radiation a patient receives. It is also used in radiation protection to measure radiation dose and in radiobiology for biological dose.

History

The gray was named after British physicist Louis Harold Gray, a pioneer in the field of radiobiology. It was adopted as an SI unit in 1975.

See also

• Sievert
• Radiation therapy
• Radiobiology
• Radiation protection

References

Gray Resources
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