Advanced dating technique
Scientists can use optically stimulated luminescence to date the burial of sand grains like quartz and feldspar.Optically stimulated luminescence relies on quartz grains being fully bleached by the sun between burial episodes – so if your glacial meltwater stream is very murky, your quartz may not have received the full blast of the sun’s energy and the signal may not be fully reset.Measuring the environmental dose rate for an OSL sample from Glen Tulla, Scotland.The gamma spectrometer has been put into the sample hole (see the lead going from the gamma spectrometer crystal to the control box).Around Antarctica, the ocean water has a radiocarbon age of around 1300 years, though this varies spatially and may have varied in time as well.
But it is important not to take these ages at face value, and to think critically about whether or not they may be accurate.
The merger of two neutron stars captivated thousands of observers and fulfilled multiple astrophysical predictions On 17 August, scientists around the world witnessed something never seen before: One hundred and thirty million light-years away, two neutron stars spiraled into each other in a spectacular explosion that was studied by observatories ranging from gamma ray detectors to radio telescopes.
The blast confirmed several key astrophysical models, revealed a birthplace of many heavy elements, and tested the general theory of relativity as never before.
The danger of inheritance (previously accumulated cosmogenic isotopes in a boulder) means that some scientists argue that, in the case of geological scatter, the youngest age is likely to be most accurate.
However, if your moraine was unstable (perhaps it was ice cored?
Scientists must understand the sources of error in their dating techniques before calculated ages can be reliably used.