Cs 137 sediment dating
30-50g of dried sample is required for analysis using a standard gamma spectrometer or 5g using a Well detector.
Pb-210 activity within sediment can be used to estimate accretion rates.
The samples are simply packed into petri dishes or vials, left to equilibrate for three weeks and then counted on a High Purity Germanium (HP-Ge) gamma spectrometry system.
, Cs-137), cesium-137, or radiocaesium, is a radioactive isotope of caesium which is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons.
The detectors are passive detectors that measure the amount of gamma radiation emitted by each sample.
Each isotope emits gamma rays at a distinct energy level when it goes through nuclear decay, and so by measuring the number of gamma rays at each level we can determine the amount of each isotope in the sample.About 5 g of dried sample, from various depths of the sediment core, is required.