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Page 7 in the rubidium strontium method rubidium 87 decays with a half life of 48. Closed system a system rock planet etc. Floating records which are not tied to the present time exist farther back than this but their ages are not known with absolute certainty. Unlike sand in an hourglass which drops at a constant rate independent of how much remains in the top half of the glass the number of radioactive decays is proportional to the amount of parent remaining. For example you would use radioactive isotope carbon 14 to date anything under 70 000 years that was once living. But there is no way to measure how much parent element was originally there. The half lives of decays occurring hundreds of thousands of years ago are thus carefully recorded.
two of the most frequently used of these uranium series systems are uranium 234 and thorium 230. In these slightly unusual cases the date given by the normal potassium argon method is too old. Vast amounts of data overwhelmingly favor an old earth. There is a suspicion that the relative abundance of carbon 14 could be changing due to the thinning of the ozone layer. It works pretty well on fossils but it would not work well on your mother. It wasn t that people just thought it had to be that way they actually quoted scriptures the earth is firmly fixed it shall not be moved psalm 104 5 or the sun stood still joshua 10 13 why should it say the sun stood still if it is the earth s rotation that causes day and night. It is difficult to find continuous tree ring records through this period of rapid climate change.
So a number of applications of the thorium 230 method are based on this chemical partition between uranium and thorium. What change does this have on uncalibrated carbon 14 ages. 6 billion years and in fact it is consistent.The time since formation of a rock by means of the radioactive decay of its material. Publicizing this incorrect age as a completely new finding was inappropriate. 1 mg per metric ton 1 part in 10 10 . 5 however in reality there is often a small amount of argon remaining in a rock when it hardens.