Main definitions of gray in English

: gray1gray2

gray1

adjective

Main definitions of gray in English

: gray1gray2

gray2

(also Gy)

noun

Physics
  • The SI unit of the absorbed dose of ionizing radiation, corresponding to one joule per kilogram.

    • ‘Radiation doses are measured in rads or grays, where 1 gray equals 100 rads.’
    • ‘The sievert is numerically equivalent to the gray for electrons and for X-rays irradiating the whole body.’
    • ‘To calculate the dose equivalent one of the workers would receive in sieverts, you would need to multiply the dose in grays, by the quality factor.’
    • ‘When a doctor prescribes a treatment he will define it in terms of dose in Grays required at a point.’
    • ‘Thus for these particular radiations the dose equivalent in sieverts is numerically equal to the absorbed dose in grays.’

Origin

1970s: named after Louis H. Gray (1905–65), English radiobiologist.

Pronunciation

gray

/ɡreɪ/