The least radio sensitive tissue is -
Human Cell Radiation Sensitivity High Lymphocytes (white blood cells) Spermatogonia (sperm-producing cells) Erythroblasts (immature red blood cells) Intestinal crypt cells (small intestine) Mid Spermatids (non-dividing immature sperm) Osteoblasts (immature bone cells) Low Muscle cells Nerve cells
Nervous tissue
Bone
Kidney
Thyroid
Radiotherapy