Lichen is the symbiotic association of a fungus (the mycobiont, which provides shelter and structure for the partnership or symbiosis), with an alga or cyanobacterium (the phoâ¦tobiont, also known as the phycobiont, which provides the food for the partnership from photosynthesis).
Some radiation therapy delivery methods include: 1  External beam radiation therapy â radiation is directed from a machine outside the body onto cancerous cells within the body.  Internal radiation therapy â radioactive material is placed (via a catheter or other carrier) directly into or near a tumor.
Radiation Therapy for Lymphoma and Leukemia. Guide. Radiation therapy is the use of high-dose X-rays to destroy cancer cells. Radiation therapy is often used for the treatment of cancer, such as non-Hodgkin's lymphoma (NHL) , Hodgkin's lymphoma, and all types of leukemia.