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Radiation is produced by the natural decay of radioactive materials.
Each type of radiation has different properties and will react with matter in different ways. To minimize your radiation exposure, spend as little time as possible near the source, stay as far away as possible, and put some shielding between yourself and the source. It is very important to point out that everyone receives radiation from a number of natural and commonly accepted man-made sources. Common building materials, such as marble and granite, contain measurable amounts of natural radon, uranium and thorium isotopes. Medical and dental X-rays contribute to our exposure.