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Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Nuclear Transmutation03:20

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Chernobyl retrospective.

F J Bonte1

  • 1Nuclear Medicine Center, University of Texas Health Science Center, Dallas 75235.

Seminars in Nuclear Medicine
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Summary
This summary is machine-generated.

The 1986 Chernobyl nuclear disaster released massive radioactive isotopes, causing immediate deaths and widespread fallout. This event spurred international cooperation on radiation disaster management.

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Area of Science:

  • Nuclear Engineering
  • Environmental Science
  • Public Health

Background:

  • A catastrophic nuclear power reactor accident occurred at Chernobyl in 1986.
  • The event released significant quantities of radioactive isotopes, including Iodine-131 and Cesium-137.
  • This release far surpassed that of the Three Mile Island accident.

Purpose of the Study:

  • To detail the Chernobyl nuclear disaster.
  • To describe the immediate and short-term consequences.
  • To examine the global impact and subsequent international policy changes.

Main Methods:

  • Analysis of radioactive fallout data from Sweden and globally.
  • Review of accident response and patient treatment protocols.
  • Examination of reactor design and operational factors leading to the explosion.
  • Tracking of evacuation procedures and population monitoring.

Main Results:

  • The Chernobyl disaster released 40 million Ci of 131I, 3 million Ci of 137Cs, and 50 million Ci of xenon.
  • Thirty-one immediate fatalities occurred due to explosion, burns, and radiation.
  • 135,000 residents were evacuated from the Chernobyl vicinity.
  • Radioactive fallout was detected across Europe and the Northern Hemisphere.

Conclusions:

  • The Chernobyl accident highlighted the dangers of antiquated reactor designs and experimental procedures.
  • Effective emergency response and evacuation plans are crucial for mitigating radiation disasters.
  • The incident led to the establishment of international agreements for radiation disaster information sharing and management.