Radiology

RELATIVE RADIO SENSITIVITY OF THE TISSUES Radiosensitive (2500 r or less kills or seriously injures many cells) Lymphocytes and lymphoblasts Bone marrow (myeloblastic and erythroblastic cells) Epithelium Germ cells (testes and ovary) Radioresponsive (2500-5000 r kills or seriously injures many cells) Epithelium of skin and many appendages. Endothelium of blood vessels Salivary glands Growing bone and cartilage. Conjunctiva, cornea and lens of eye …

DENTAL X-RAY TUBE The dental X-ray tube is surrounded by a glass envelope that houses a vacuum. The glass prevents low-grade radiation from escaping. The vacuum insures the protection of the equipment from catastrophic failure. Production of X-rays generates enormous amounts of heat; the vacuum prevents the risk of combustion and ensures the proper environment for conduction of electrons. There are two separate energy sources, one that powers the energy poten…