11. Radium, being a decay product of uranium, is found in all uranium-bearing ores. 12. The ratio is less than 190 when the decay products of each are included. 13. Purified comes into equilibrium with its decay products after about a half of year. 14. The gold did contain radioactive decay products of 222 Rn. 15. Analysis of argon radioactive decay products yielded an age of 65.17 ?0.64 million years. 16. Thus, in rapakivi zones, the hazard from radon, a decay product of uranium, is elevated. 17. Uranium workers are routinely exposed to low levels of radon decay products and gamma radiation. 18. Their decay products ('daughter'products ) are called radiogenic nuclides. 19. Radon and its first decay products being very short-lived, the seed is left in place. 20. Hassium has been observed as decay products of darmstadtium.
