Definition of "caesium" []

• Variant of cesium. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Their light is emitted by vaporised alkali metals such as caesium or potassium. reports they have "mass-to-power ratios that far exceed what is possible with today's other laser systems"."
• "Radioactive caesium 137, for instance, mimics potassium and thus can be taken up in plants that are later eaten and the radioactivity concentrated by grazing animals."
• "There has always been a natural level of radioactivity in certain soils – those on a granite substrate for instance – but the caesium 137 fallout from Chernobyl is still relatively high in some areas."