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Carbon 14 dating otzi
This assumes, however, that today's C-14 increase is only the result of the industrial revolution (which is unfalsifiable) and that the proportion was in equilibrium prior to the 19th century (which is also unfalsifiable).
In other words, while acknowledging the problem posed by the increasing C-14, the uniformitarian scientists have failed to solve it, and yet continue to use the methodology.
It is impossible to determine whether it has always been increasing (as argued by some creationists) or whether it has undergone cycles of increase and decrease (as argued by other creationists and evolutionary scientists).
C-12 and C-14 are two different isotopes of carbon.
Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).
The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.
However, radioisotope dating may not work so well in the future.
Anything that dies after the 1940s, when Nuclear bombs, nuclear reactors and open-air nuclear tests started changing things, will be harder to date precisely.