rad

• Nom désignant une unité de dose de radiation ionisante absorbée, égale à 100 ergs par gramme de matériau irradié, ou une unité d'angle plan égale à l'angle sous-tendu par un arc dont la longueur est égale au rayon.

A noun referring to a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material, or a unit of plane angle equal to the angle subtended by an arc equal in length to the radius.

1. Unit of absorbed radiationC1formalscientific

   A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material.

   rad (unité de dose absorbée)

   • The patient received a dose of 5 rads during the treatment.
   • Exposure to 100 rads can cause acute radiation sickness.
   • The device measured the radiation in rads per hour.

2. C1formalscientific

   The unit of plane angle adopted under the Système International d'Unités; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees).

   radian

   • The angle was measured as 2.5 radians.
   • In mathematics, the radian is the standard unit for angular measure.
   • Convert 180 degrees to radians for the calculation.

   Synonymesradian