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can we be sure the U and Th have always decayed at the same rates we measure today? The second assumption is much more speculative since there is no way to verify whether or not some (or most) of the daughter element was already present when the rock solidified. However, in some cases, a few scientists are telling us that they have solved this problem.
For example, with the uranium/lead method scientists have attempted to estimate what the original ratio (of uranium-238 to lead-206) was when the Earth formed.
In fact, about 98% of common lead is "radiogenic" (containing lead 206, 207, 208) and only 2% non-radiogenic.Therefore, if a scientist has strong beliefs about this topic, he or she will tend to be biased against any evidence that contradicts their beliefs with regard to the earth's reported age: of 4.5 billion years. that (the) half-lives (of uranium-thorium-lead) are not constant but vary with time. comes from the study of pleochroic haloes which form in a rock in the following way.For example, the 67 ( ) other methods of dating the earth, solar system, and/or universe. When a rock crystallises, the crystals of the minerals in the rock often enclose minute grains of other minerals which contain uranium and thorium.With the exception of Carbon-14, radiometric dating is used to date either igneous or metamorphic rocks that contain radioactive elements such as uranium, thorium, argon, etc. Now when the uranium or thorium disintegrates, the alpha particles which are emitted are slowed down by the crystals in which the grains of the uranium- or thorium-bearing minerals are embedded.And even though various radioactive elements have been used to 'date' such rocks, for the most part, the methods are the same. This means that if you had some pure uranium-238 with no lead, that 4.5 billion years later, one half of it would have decayed into its stable daughter product (lead-206). Where these alpha particles finally stop, crystal deformation occurs (and) shows up as a discolouration or a darkening of the crystals.