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The closed system hypothesis is carefully considered (the method is not applied to rocks that obviously have been chemically altered), but there is need for caution here.
The initial concentration hypothesis may be the weakest part of the process of calculating radiometric dates.
Therefore, it is reasonable that He would create rocks that appear mature also.
This means that if one started with 1000 atoms of potassium-40, 500 of them would change into argon-40 in 1.3 billion years.
Other creationists hold that the planet itself was created during creation week, perhaps early in the first day of creation.