11. The other container contained a " Ra-226 radioactive source ." 12. Sprytrons lack the keepalive electrode and the preionization radioactive source . 13. Iraq has more than 1, 000 radioactive sources , 400 of them at Tuwaitha, Fleming said. 14. Hospitals are trying to minimize their reliance on radioactive sources for therapy, diagnosis and research. 15. The spectrum of radioactive sources is so wide, and the number out there is immense. 16. Radioactive sources are used for logging formation parameters.17. Monitoring is instead achieved by incorporating radioactive sources at points where erosion is known to occur. 18. To accumulate positrons, the researchers use a new device that collects them from a radioactive source . 19. A radioactive source , meanwhile, was used to create positrons, which were held in a separate trap. 20. Four of the containers were similar to those designed for shielding radioactive sources , the agency said.
