ESR of E′ centres in unstrained geological quartz grains
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E1' centres are detectable by ESR spectroscopy in unstrained quartz extracted from weathered rock of Cretaceous age. These centres completely disappear when the samples are irradiated with an artificial gamma-dose of about 200 Gy. The concentration of E1' centres thermally (re)generated at 310 degrees C can be reduced drastically under the influence of gamma-quanta, too. The gamma-radiation induces thermally unstable components in the quartz matrices that start to decay at around 100 degrees C.
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