Introduction to Radiation - Canadian Nuclear Safety …

December 2012 Introduction to Radiation Introduction to Radiation Minister of Public Works and Government Services Canada (PWGSC) 2012 PWGSC catalogue number CC172-93/2012E-PDF ISBN 978-1-100-21572-3 Published by the Canadian Nuclear Safety Commission (CNSC) Extracts from this document may be reproduced for individual use without permission provided the source is fully acknowledged. However, reproduction in whole or in part for purposes of resale or redistribution requires prior written permission from the Canadian Nuclear Safety Commission. galement publi en fran ais sous le titre de : Introduction au rayonnement Document availability This document can be viewed on the CNSC Web site at To order a printed copy of the document in English or French, please contact: Canadian Nuclear Safety Commission 280 Slater Street Box 1046, Station B Ottawa, Ontario K1P 5S9 CANADA Tel.

The time it takes for a radioisotope to decay to half of its starting activity is called the radiological half-life, which is denoted by the symbol t. ½. Each radioisotope has a unique half-life, and it can range from a fraction of a second to billions of years. For example, iodine-131 has an eight-day half-life, whereas plutonium-239 has a ...

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