Skip to main content

Cesium 137

Cesium 137

A radioactive isotope of the metallic element cesium. Cesium-137 is one of the major products formed when uranium undergoes nuclear fission , as in a nuclear reactor or nuclear weapons . During atmospheric testing of nuclear weapons after World War II, cesium-137 was a source of major concern to health scientists. Researchers found that the isotope settled to the ground, where it was absorbed by plants and eaten by animals, ultimately affecting humans. Once inside the human body, the isotope releases beta particles, which are carcinogens, teratogens, and mutagens. Large quantities of cesium-137 were released when the Chernobyl nuclear reactor exploded in 1986.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Cesium 137." Environmental Encyclopedia. . 21 Jan. 2019 <>.

"Cesium 137." Environmental Encyclopedia. . (January 21, 2019).

"Cesium 137." Environmental Encyclopedia. . Retrieved January 21, 2019 from

Learn more about citation styles

Citation styles gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, cannot guarantee each citation it generates. Therefore, it’s best to use citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

The Chicago Manual of Style

American Psychological Association

  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.