(thÃ»r'mÄ«'Én) An electrically charged particle or ion that is emitted by a heated conducting material. The electrons emitted from the cathodes of electron tubes (such as cathode ray tubes) are thermions.
A low white blood cell count (leukopenia) is a decrease in disease-fighting cells (leukocytes) in your blood. Leukopenia is almost always related to a decrease in a certain type of white blood cell (neutrophil). The definition of low white blood cell count varies from one medical practice to another. In general, for adults a count lower than 4,000 white blood cells per microliter of blood is considered a low white blood cell count. For children, that threshold varies with age.
Ask your doctor to help you understand what your results mean. Low white blood cell count. Some cancer treatments, mainly chemotherapy, may cause a decrease in your body's white blood cells. Cancers that affect the blood and bone marrow can also cause a decrease in the count.sk your doctor to help you understand what your results mean. Low white blood cell count. Some cancer treatments, mainly chemotherapy, may cause a decrease in your body's white blood cells. Cancers that affect the blood and bone marrow can also cause a decrease in the count.