In a 3 x 10 9 year old rock that originally contained some 238 U, which has a half life of 4 5 x 10 9 years, we expect to find some 238 U remaining in it Why are 226 Ra, 222 Rn, and 210 Po also found in such a rock, even though they have much shorter half lives (1600 years, 3 8 days, and 138 days, ...

The reason why 226Ra 222Rn and 210Po are found in a 3 x 109yearold rock that originally contained so ...

In a 3 x 10 9 -year-old rock that originally contained some 238 U, which has a

Question:

In a 3 x 10⁹ -year-old rock that originally contained some ²³⁸U, which has a half-life of 4.5 x 10⁹ years, we expect to find some ²³⁸U remaining in it. Why are ²²⁶Ra, ²²²Rn, and ²¹⁰Po also found in such a rock, even though they have much shorter half-lives (1600 years, 3.8 days, and 138 days, respectively)?