Wiens has a Ph D in Physics, with a minor in Geology.
His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.
In this case, U238 is the “parent” and Pb206 is the “daughter.” Scientists begin by measuring how long it takes for a parent isotope to decay into a daughter isotope.
In this particular case, it takes 4,460,000,000 years for half of a sample of U238 to decay into Pb206.
So, don't try and cover it up and make like everything was 6,000 years.
That's not the Bible.” Before answering the question, Robertson acknowledged the statement was controversial by saying, “I know that people will probably try to lynch me when I say this.” “If you fight science, you are going to lose your children, and I believe in telling them the way it was,” Robertson concluded.
The three key underlying assumptions are 1) the rate of decay of parent into daughter has remained constant throughout the unobservable past; 2) the specimen which we are examining hasn’t been contaminated in any way (that is, no parent or daughter has been added or taken away at any point during the unobservable past), and 3) we can determine how much parent and daughter were present at the beginning of the decay process – not all of the Pb206 present today necessarily came from decaying U238; Pb206 may have been part of the original constitution of the specimen.
The time it takes for half of a sample to decay is called a “half-life.” By measuring radioactive half-lives, by measuring how much parent and daughter are present in any given specimen, and by making certain key assumptions, scientists believe they are able to accurately determine the age of a specimen. The question is what are the underlying key assumptions and how reliable are they?
Forty-six percent of Americans believe that God created humans in their present form at one point within the past 10,000 years, according to a survey released by Gallup in June.
That number has remained unchanged for the past 30 years, since 1982, when Gallup first asked the question on creationism versus evolution.
Many Christians have been led to distrust radiometric dating and are completely unaware of the great number of laboratory measurements that have shown these methods to be consistent.
Many are also unaware that Bible-believing Christians are among those actively involved in radiometric dating.