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Both 10Be and 36Cl are formed as charged ions in the ionosphere. Thus each annual layer starts 10Be and 36Cl poor, becomes 10Be and 36Cl rich, and then becomes poor again. Although what is said above is true, this is an exceedingly minor effect.

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This process also depends on the relative temperatures of different years, which allows comparison with paleoclimatic data.

Thus, each annual layer starts 18O rich, becomes 18O poor, and ends up 18O rich.

9Be and 35Cl) one can determine the season of the year the precipitation occurred.

By comparing the ratios of these isotopes to their nonradioactive counterparts (i.e.

The major disadvantage of this method is that one must have a previously age-dated ice core to start with.

In this method one compares certain inclusions in dated ocean cores with related inclusions found in the ice-core of a still undetermined age. Hyde has posted separately some of the relationships between ocean core data and their astronomical causes.

The amount of "leakage" depends on the height of the ionosophere, which changes primarily in response to the Solar cycle, with periods of maximum solar activity corresponding to the highest extent of the ionosphere.

It should be noted that the 10Be/9Be ratios for some ice cores have been compared with the known solar cycle and are in excellent agreement with what is known (accurately showing the time of the European Little Ice Age, which corresponded with a remarkably low amount of solar activity).

The major disadvantage of this dating method is that these isotopes also tend to diffuse over time.

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