Radiosensitivity is the relative susceptibility of cells, tissues, organs, organisms, or other substances to the injurious action of radiation. In general, it has been found that cell radio sensitivity is directly proportional to the rate of cell division and inversely proportional to the degree of cell differentiation. In short, this means that actively dividing cells or those not fully mature are most at risk from radiation. The most radio-sensitive cells are those which have a high division rate,have a high metabolic rate,are of a non-specialized type and are well nourished.High Radio sensitivity: Lymphoid organs, bone marrow, blood, testes, ovaries, intestines .Fairly High Radio-sensitivity :Skin and other organs with epithelial cell lining (cornea, oral cavity, esophagus, rectum, bladder, vagina, uterine cervix, ureters).
Moderate Radio sensitivity: Optic lens, stomach, growing cartilage, fine vasculature, growing bone.Fairly Low Radio sensitivity: Mature cartilage or bones, salivary glands, respiratory organs, kidneys, liver, pancreas, thyroid, adrenal and pituitary glands.
Low Radio sensitivity: Muscle, brain, spinal cord

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