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The amount of radiation administered.

Radiotherapy is the treatment of disease by means of ionizing radiation.

The amount or dose of radiation administered is measured in grays. The gray (Gy) is the SI (International System of Units) unit of absorbed radiation dose of ionizing radiation (for example, X-rays), and is defined as the absorption of one joule of ionizing radiation by one kilogram of matter (usually human tissue).


Dorland I, Newman WA 2003. Dorland's illustrated medical dictionary (30th edn). Philadelphia: Saunders p1564

Myers T (Editor) 2009. Mosby’s Medical Dictionary , 8th Edition. Missouri: Mosby Elsevier page 820

This content Based on Australian Institute of Health and Welfare material. Attribution provided as required under the AIHW CC-BY licence.

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