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Radioactive Decay and Radiometric Dating02:48

Radioactive Decay and Radiometric Dating

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Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
An isotope containing...
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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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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
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Amnon (Amy) Piepsz, MD (1938-2021).

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Revised Introduction by the Author to Accompany Blaufox MD. Radioactive Artifacts: Historical Sources of Modern Radium Contamination. Semin Nucl Med. 1988; 18:46-64.

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Radioactive Artifacts: Historical Sources of Modern Radium Contamination.

M Donald Blaufox1

  • 1From the Department of Nuclear Medicine, Montefiore Hospital and Medical Center, Albert Einstein College of Medicine, New York.

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|December 22, 2019
PubMed
Summary
This summary is machine-generated.

Antique radium items are common but pose disposal challenges. Proper surveying and disposal are crucial for these radioactive artifacts.

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Area of Science:

  • Radiological Health
  • Environmental Science
  • Historical Technology

Background:

  • Radium was widely incorporated into consumer products, medical devices, and scientific instruments in the early 20th century.
  • Public fascination with radioactivity and perceived curative properties fueled radium's distribution.
  • Manufacturing included legitimate medical and scientific applications alongside "quack cures" and novelty items.

Observation:

  • Antique objects containing radium are frequently found in markets and antique dealerships.
  • These items range from medical devices and scientific instruments to watches, clocks, and even novelty items.
  • Some items contained significant amounts of radium, from nanocuries to hundreds of microcuries.

Findings:

  • Radium's historical use has resulted in a persistent presence of radioactive materials in various forms.
  • Disposal of these aged radium-containing objects presents significant environmental and logistical challenges.
  • Lack of a uniform disposal mechanism complicates the management of non-institutional radioactive sources.

Implications:

  • All discovered radium-containing objects require serious consideration and proper radiological surveying.
  • Safe storage or disposal through specialized commercial sources is necessary for identified radium items.
  • Significant quantities of radium pose extraordinary disposal difficulties, with limited acceptance sites available.