16766206
Description
Mind Map by Sabrina Harlen, updated more than 1 year ago
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Created by Sabrina Harlen
about 5 years ago
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Absolute Dating
- Definition: this means the artefact being dated has a
specific date in the calender to when it was used.
Unlike relative dating where it has an estimated time
period.
- DATING METHODS:
- DENDROCRONOLOGY: this is used for
wooden products such as posts and
beams from particular dates in time.
This is the studying of rings in the
wooden products. The overlapping of
rings in the wood are counted to find a
date. This way of dating wood is both
absolute and relative.
- RADIOCARBON: By measuring the
amount of C14 left in an organic sample.
The C14 would decay with a half-life of
5,568 plus or minus 30 years.
- POTASSIUM/ARGON DATING: This is a method
based on measuring the decay of radioactive 40K
atom into argon 40. Using spectrometer the
concentration of argon in volcanic rock can be
measured and the date of the layer of rock can be
found out. This method can be only used for
volcanic rock older than 400,000 years.
- OBSIDIAN HYDRATION DATING:
with obsidian when it is
exposed to air a layer goes
around it. Over time the layer
gets thicker. By measuring the
thickness of the layer it gives
an estimated time of usage.
- THERMOLUMINESCENCE: This measures the
amount of radiation in an artefact from being
exposed to heat or sunlight and therefore
determines the time elapsed since exposure.
- OPTICALLY STIMULATED LUMINESCENCE: Similar to
Thermoluminescence. The main difference is that the trapped
electrons are released by being in bright light. Critical that the
artefacts do not get exposed to sunlight when it is being collected. If
so the date that was initially going to be tested would then change to
the date it was exposed to sunlight and that was when they collected
the artefact, therefore, results in it being inaccurate.
- AMINO ACID DATING: Uses change of configuration
of amino acids in biological tissues to determine date
of artefact.
- DENDROCRONOLOGY: this is used for
wooden products such as posts and
beams from particular dates in time.
This is the studying of rings in the
wooden products. The overlapping of
rings in the wood are counted to find a
date. This way of dating wood is both
absolute and relative.
- DISADVANTAGES:
- Although scientists use great caution
when dating artefacts they do make
mistakes. This results in having in
ascertain date of artefacts .
- Although scientists use great caution
when dating artefacts they do make
mistakes. This results in having in
ascertain date of artefacts .
- ADVANTAGES:
- Provides an exact date to
artefacts for archaeologists.
- Provides information about
the past in a more accurate
way.
- Provides an exact date to
artefacts for archaeologists.
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