The document discusses the potential health effects of radiation exposure from the Fukushima nuclear crisis. It explains that there are two types of radiation: non-ionizing and ionizing. Ionizing radiation, which includes gamma rays and X-rays, can cause cancer if a person is exposed in large enough doses. Symptoms of radiation exposure include nausea, fatigue, vomiting, hair loss and diarrhea. The document also notes that radioactive iodine and cesium emitted from the Fukushima plant can be absorbed by the body and pose health risks, particularly to children, if exposure levels are high enough. It concludes that while not all radiation is dangerous, increased exposure could raise cancer risks.