Pb 210 dating services
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The overall result is that radium-226 is found at low and essentially unchanging levels in soils everywhere.We can determine how old a sediment layer is by how much The table at left shows the uranium-238 decay series and the time it takes for each product to reach only half it's original concentration (half-life).Uranium-238 is the first in the series; it decays into thorium, which decays into protactinium, which decays into uranium 234, and so on.By measuring (Cs)analyses for the 1998 short-cores from Bear Lake.Results indicate that our cores contain sediments from the 20th Century and that sedimentation rates increased when the Bear River was diverted into the lake.Although the concentration of uranium varies from location to location, it is present in essentially all soils and sediments, at least at some low level.
Over time the uranium-238 very slowly decays into uranium-234 (half-life = 248,000 ).
Note that the time it takes for each to decay varies from minutes to billions of years.
The decay emission is either an electron (Cs) is visible as a distinct peak in many recent sediments.
metal), if it is produced in soils close to the air-soil interface.
This radon emanation is a normal occurrence and thereby causes the terrestrial atmosphere to contain a low (~ 1 DPM/L = 1 disintegration per minute per litre) but fairly constant level of radioactive gas.
We have been providing radioisotope dating services for over 30 years and have dated cores from around the world (See the map below).