The global gamma radioactive sources market for NDT applications is segmented by sources into Iridium-192, Selenium-75, and Cobalt-60. For Iridium-192 and Selenium-75, detailed unit shipment forecast has been provided. Pricing analysis and market position ranking for the top participants in the market have also been given. As the Cobalt-60 market is very small, only unit shipment forecast has been provided. The base year is 2015 and the forecast period is 2016–2020. With the recent oil price decline, the market will be turbulent. However, in the long term, Selenium-75 is expected to provide growth opportunities. Cobalt-60 is likely to be phased out in the next 15 years, while growth of Iridium-192 will be tepid in most regions.