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Rad 音標拼音: [r'æd] 弧度單位 弧度單位 rad n 1: a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material 2: the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) [synonym: {radian}, {rad}] Rad \Rad\ (r[a^]d), n. [radiation absorbed dose.] A unit of measurement of the amount of ionizing radiation absorbed by an object, equal to an energy of 100 ergs per gram of irradiated material (equal to 0.01 gray). [PJC] Rad \Rad\ (r[a^]d), obs. imp. & p. p. of {Read}, {Rede}. --Spenser. [1913 Webster] |
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