Potassium 40, the main source of radioactivity in our bodies, has a half-life of 1.42 billion years. Types of Radiation The term "radiation" is very broad, and includes such things as light and radio ...

All types of radiation become less intense as they travel further away from the radioactive material. This is because the particles or rays become more spread out. The thicker the substance ...

Radiation therapy for salivary gland tumors involves sending high-energy particles (usually photons or protons) through the skin toward the tumor. When the particles reach the tumor, they can destroy ...

Our radiation oncologists, including Nancy Lee, have special training in caring for people with head and neck cancer. Radiation therapy is a cancer treatment that involves sending high-energy beams of ...