Japan Releases Results of Nuclear Accident.In a May 2000 special issue of the Journal of Environmental Radioactivity The environmental radioactivity page is devoted to the subject of radioactive materials in the Human Environment. While some isotopes are only found on earth as a result of human activity (e.g. , Japanese researchers released the results of their study on the effects of a 30 September 1999 accident at a uranium conversion plant in Tokaimura. The accident resulted in at least 14 workers being exposed to radiation, with 3 being hospitalized. The researchers found that no neutron neutron, uncharged elementary particle of slightly greater mass than the proton. It was discovered by James Chadwick in 1932. The stable isotopes of all elements except hydrogen and helium contain a number of neutrons equal to or greater than the number of protons. monitoring of the site occurred until 6.5 hours after the accident. They used household items provided by residents living near the plant to calculate the radiation dose, which was estimated to be about 100 mSv (the normal annual safe limit for the public is 1 mSv). The scientists determined that discharges of radioactive noble gases and iodine iodine (ī`ədīn, –dĭn) [Gr.,=violet], nonmetallic chemical element; symbol I; at. no. 53; at. wt. 126.9045; m.p. 113.5°C;; b.p. 184.35°C;; sp. gr. 4.93 at 20°C;; valence −1, +1, +3, +5, or +7. isotopes An isotope a type of neutral atom but the number of neutrons is different from the number of protons in the nucleus. May be radioactive. Elements 1-15 Hydrogen
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