9.4 Activities in Areas under Evacuation Orders.Chapter 9 Efforts toward Recovery from the Accident.8.1 Measures for Radioactive Materials in Foods.Chapter 8 Radioactive Materials in Foods.7.9 Deposition of Other Radioactive Materials.7.7 Radiation Monitoring of Public Water Areas.7.6 Radiation Monitoring of Clean Water.7.2 Deposition of Radioactive Cesium and Radioactive Iodine.7.1 Spatiotemporal Distribution of Ambient Dose Rates range of parameters presently being used in power reactors, the proportions of the fission products from uranium-235 fission may be expected to vary only.Chapter 7 Environmental Radiation Monitoring.6.3 Efforts and Progress for Decommissioning.6.1 Fukushima Daiichi Nuclear Power Station (NPS) Accident.Chapter 6 Situation concerning the Accident.5.1 WHO Reports and UNSCEAR 2013 Report.Chapter 5 Assessments by International Organizations.4.1 Principles of Radiological Protection.Chapter 4 Concept of Radiological Protection.3.3 Deterministic Effects (Tissue Reactions).3.2 Mechanism of Causing Effects on Human Body.Included in this reference material on March 31, 2013.In a typical nuclear reaction involving 235U and a neutron. Nuclear facilities are equipped with a variety of mechanisms for preventing leakage of radioactive materials, but if they all stop functioning properly, radioactive leaks will occur. Nuclear fusion and nuclear fission are different types of reactions that release energy due. Through beta disintegration, Xenon-133 and the like, which are nuclear fission products, disintegrate into Cesium-133, and Cesium-133 then turns into Cesium-134 as decelerated neutrons are trapped.Īs long as the reactor is working properly, these products remain in nuclear fuel rods and do not leak out of the reactor. When Uranium-238 is bombarded with neutrons, Plutonium-239 is created.Ĭesium-134 is not created directly from the nuclear fission of Uranium-235. Radioactive nuclear fission products such as Iodine-131, Cesium-137, and Strontium-90 are created in this process. Bombarding enriched uranium fuel (Uranium-235: 3-5% Uranium-238: 95-97%) with neutrons results in nuclear fission. The light-water nuclear reactor is currently the most widely used type of reactor around the world (also used at Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi NPS).
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