seattle speed dating meetup - Limitations of carbon dating

For example, you may want to date the same zircon crystals using the U-Pb method.

The reason it isn't 1 million year old is because the half-life of 14-C is about 5 730 years, which means after about 50 000 years there is no more 14-C to measure, hence the limit of that dating technique is about 50 000 years.

All different decay series' have upper and lower limits for which they work effectively.

For an example, when they tried to get the carbon dating for presence of Aboriginal people in Australia they get to the number 40,000. Why is that 40,000 years limit for carbon dating methods?

Carbon-14 makes up about 1 part per trillion of the carbon atoms around us, and this proportion remains roughly constant due to continual production of carbon-14 from cosmic rays.

So some analytical limitations can be the beam intensity, counting statistics, dead-time and so on.

These are parameters you can control and will affect how accurate and precise your age-dating is.

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