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viagra dose vs viagra The degree of radiation desired, and the most convenient method for the individual's circumstances. The purpose of such radiation therapy is to destroy cancerous cells with minimal damage to normal healthy tissue or systemic involvement. Ionizing radiation bombards the cells exposed to it and breaks the molecular bonds essential to cell growth. There is always the accompanying destruction of some normal tissue along with the tumour. Cancer growths that reproduce rapidly are generally more easily eradicated by radiation than slower-growing ones; some tumours are destroyed by irradiation treatment, while others are unaffected by it. The complications of radiation therapy may include vomiting (ionizing radiation injury), nausea, hair loss, weight loss, weakness, drop in blood cell counts, and skin disorders. â â â â â â easily accessible tumours of fairly small size are often treated by implantation of radioactive wires, threads, seeds, tubes, molds, or foams. cheap viagra buy cheap viagra cheap viagra online cheap viagra online generic viagra online buy cheap viagra cheap generic viagra viagra without a doctor prescription viagra for sale cheap viagra generic The radiation sources can be radium and radon, or radioactive isotopes (radioactive isotope)—radioactive forms of such metals as cesium, cobalt, gold, iridium, and tantalum. All of these isotopes emit gamma rays, which produce deep penetration and cause a minimum of surface-tissue irradiation. The elements are sealed in glass tubes, wires, or needles for easy tissue insertion and an even distribution of radiation. The implants can be permanent or temporary. The radiation dose by this method is usually slow and continuous, which gives the more resilient normal cells time to repair any damage that might be inflicted on them while the cancer cells are being destroyed. The advantages of implantation are that the tumour can be treated locally without involving other areas of the body; the radiation is continuous; the rays can be directed to conform to specific structural contours, as in the bladder, uterus, or mouth; and there is minimum deformity and interference with function. Tumours respond best to this therapy if they are small, rapidly growing, and discovered early. â â â â â â external radiation must penetrate the outer body and reach the tumour. More normal tissue is affected this way, but larger growths are more readily cured. The treatments involve a series of about 10 to 20 or more radiation sessions over a period of several months. This type of t.