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Expanded
In nature and artificially produced elements, some can automatically decay and emit rays invisible to the naked eye. These elements are collectively known as radioactive elements or radioactive substances. In the natural state, the rays from the universe and the Earth's environment itself radioactive elements generally do not bring harm to living creatures. since the 1950s, human activities have made artificial radiation and artificial radioactive substances greatly increased, the intensity of the rays in the environment and the consequent increase in the crisis of the survival of living creatures, resulting in radioactive contamination. Radioactive pollution is difficult to eliminate, ray strength can only be weakened over time.
Radioactive contamination characteristics:
1, the vast majority of radionuclide toxicity, according to the weight of the poison itself, are higher than the general chemical poisons. 2, according to the effect of radioactive damage, may affect the genetic heritage of the future generations to bring the potential for trouble. 3, the size of the radioactive dose can only be detected by the radiation detector, non-human sensory organs can be known. 4, the size of the radioactive dose of the radiation detector, the human organ can not be known.
4, the ray of sub-lighting with penetrating, especially r-ray can penetrate a certain thickness of the barrier layer. 5, radionuclides have the ability to metamorphosis. 6, the activity of radioactivity can only be weakened through natural decay.