Radioactivity
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Radioactivity, also known as radioactive decay, describes the process of spontaneous breakdown of unstable (or radioactive) nuclides, with the formation of daughter nuclei and release of subatomic particles and/or gamma radiation.
Modes of decay
Radioactive decay is a stochastic process, i.e. it is probabilistic, and it is impossible to foresee which specific nuclei will decay. Nevertheless it can be predicted with a high degree of confidence the proportion of any sample of radioactive atoms that will decay in a specified period of time.
History and etymology
Henri Becquerel (1852-1908) discovered radioactivity in 1896 when studying potassium uranyl sulfate 2.
-<p><strong>Radioactivity</strong>, also known as <strong>radioactive decay</strong>, describes the process of spontaneous breakdown of unstable (or radioactive) nuclides, with the formation of daughter nuclei and release of subatomic particles and/or <a title="gamma radiation" href="/articles/gamma-decay">gamma radiation</a>. </p><h4>Modes of decay</h4><ul>-<li><a title="Alpha decay" href="/articles/alpha-decay">alpha decay</a></li>-<li><a title="Beta decay" href="/articles/beta-decay">beta decay</a></li>-<li><a title="Electron capture" href="/articles/electron-capture">electron capture</a></li>-<li><a title="spontaneous fission" href="/articles/spontaneous-fission">spontaneous fission</a></li>- +<p><strong>Radioactivity</strong>, also known as <strong>radioactive decay</strong>, describes the process of spontaneous breakdown of unstable (or radioactive) nuclides, with the formation of daughter nuclei and release of subatomic particles and/or <a href="/articles/gamma-decay">gamma radiation</a>. </p><h4>Modes of decay</h4><ul>
- +<li><a href="/articles/alpha-decay">alpha decay</a></li>
- +<li><a href="/articles/beta-decay">beta decay</a></li>
- +<li><a href="/articles/electron-capture">electron capture</a></li>
- +<li><a href="/articles/spontaneous-fission">spontaneous fission</a></li>
-<a title="isomeric transition" href="/articles/isomeric-transition">isomeric transition</a><ul>-<li><a title="Gamma decay" href="/articles/gamma-decay">gamma (γ) ray emission (gamma decay)</a></li>-<li><a title="internal conversion" href="/articles/internal-conversion">internal conversion</a></li>- +<a href="/articles/isomeric-transition">isomeric transition</a><ul>
- +<li><a href="/articles/gamma-decay">gamma (γ) ray emission (gamma decay)</a></li>
- +<li><a href="/articles/internal-conversion">internal conversion</a></li>
-</ul><p>Radioactive decay is a stochastic process, i.e. it is probabilistic, and it is impossible to foresee which specific nuclei will decay. Nevertheless it can be predicted with a high degree of confidence the proportion of any sample of radioactive atoms that will decay in a specified period of time.</p><h4>History and etymology</h4><p><a title="Antoine Henri Becquerel" href="/articles/antoine-henri-becquerel">Henri Becquerel</a> (1852-1908) discovered radioactivity in 1896 when studying potassium uranyl sulfate <sup>2</sup>. </p>- +</ul><p>Radioactive decay is a stochastic process, i.e. it is probabilistic, and it is impossible to foresee which specific nuclei will decay. Nevertheless it can be predicted with a high degree of confidence the proportion of any sample of radioactive atoms that will decay in a specified period of time.</p><h4>History and etymology</h4><p><a href="/articles/antoine-henri-becquerel">Henri Becquerel</a> (1852-1908) discovered radioactivity in 1896 when studying potassium uranyl sulfate <sup>2</sup>. </p>
References changed:
- 1. William Alexander Newman Dorland. Dorland's Illustrated Medical Dictionary. (2007) ISBN: 9781416023647 - <a href="http://books.google.com/books?vid=ISBN9781416023647">Google Books</a>
- 2. Gopal B. Saha. Physics and Radiobiology of Nuclear Medicine. (2010) ISBN: 9780387362816 - <a href="http://books.google.com/books?vid=ISBN9780387362816">Google Books</a>
- 3. R. F. Farr, P. J. Allisy-Roberts. Physics for Medical Imaging. (1997) ISBN: 9780702017704 - <a href="http://books.google.com/books?vid=ISBN9780702017704">Google Books</a>
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- Imaging Technology
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