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rock, soil, and clay produce constant low amounts of background ionizing radiation.
Although, organic materials as old as 100,000 years potentially can be dated with AMS, dates older than 60,000 years are still rare.In addition, any argon that existed prior to the last time the rock was molten will have been driven off by the intense heat.As a result, all of the argon-40 in a volcanic rock sample is assumed to date from that time.The intensity of thermoluminescence is directly related to the amount of accumulated changes produced by background radiation, which, in turn, varies with the age of the sample and the amount of trace radioactive elements it contains..It is also based on the fact that background radiation causes electrons to dislodge from their normal positions in atoms and become trapped in the crystalline lattice of the material.
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In this way, the confidence level of the dating is significantly increased.