Isotope sediment dating
This technique exploits the injection of radioisotopes into the atmosphere, which occurred during atmospheric nuclear testing, mainly in the late 1950s and mid 1960s.
It uses this injection as a marker to identify soil and sediment particles laid down at that time.
The sedimentation rate was determined using Po activity measurement in different cores of the sediment and was found to be 0.67 cm/y on average.
It was observed that the sediments were highly contaminated during the period of 1970–80 just after the green revolution in India.
If you want to dry your samples, heating at 90°C to 100°C for 4-24 hours is recommended.
Sending wet or frozen samples for radiocarbon dating is fine.
In this study, estimation of sedimentation rate using Po dating was carried out to study the depth profile of accumulated OCPs in sediments of Thane Creek Mumbai, India.
Sediments, which is an important component of marine environment can serve as sorbent or concentrator for these pollutants.
The lab starts the analyses immediately upon arrival of the sample so moisture will not induce contamination.
Please remove excess water, wrap the samples with plastic (e.g.
Cosmogenic nuclide dating is useful for directly dating rocks on the Earth’s surface.
It gives an Exposure Age: that is, how long the rock has been exposed to cosmic radiation.
Search for isotope sediment dating:
Cs is analysed by directly counting the sediment in a high resolution low background germanium gamma detector.