For example, one Gy of x-rays has less biological effect than 1 Gy of alpha particles although the amount of energy deposited is the same. The absorbed dose equivalent is mainly used in radiation protection. Every living organism is exposed to constant low dose irradiation from natural and man-made radiation. Man -made radiation exposure comes mainly from medical imaging and treatment. DNA damages may be repaired or may produce cellular mutation or death.
Early effect is due to death of parenchymal cells and is seen as inflammation or necrosis.
Radiodermititis is identified as inflammation of the irradiated skin. In diagnostic radiology, hands are the most common sites involved. This can be seen in patients who were treated with radiation therapy. Low Dose Effects Whole body irradiation with low dose is the main concern for radiation protection purposes. Clinical effects of low dose irradiation may not be obvious.