Rad

Total amount of radiation absorbed by specific material or tissues. 1) The unit for the dose absorbed from ionizing radiation, equivalent to 100 ergs per gram of tissue; 100 rad = 1 Gy. Symbol for radian. 2) Abbreviation for racemic.

Radiation Dermatosis

Skin changes at the site of ionizing radiation. Particularly redness of the skin due to capillary dilatation in the acute stage, temporary or permanent loss of hair, and chronic changes in the epidermis and dermis resembling a premalignant warty lesion.

Radiation Therapy

The use of radiation energy to interfere with tumor growth. See irradiation. The use of high-energy radiation from x-rays, gamma rays, neutrons, protons, and other sources to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body...