Abstract
The effect of radioactive radiation on ESR signals of zircon has been studied. Natural zircons and synthetic zircons doped with Ca, U, Al-U, and Ca-P were irradiated with thermal neutrons and γ-rays. ESR measurements performed on these and also on non-irradiated syn-thetic zircons containing various elements, revealed that ESR signals in a range from g=2.000 to g=2.009 are attributed to various radiations and not to impurity ions. Among them, the signal g=2.0083 changes little in intensity with the irradiations and is considered to be related only to α-decay. This has been demonstrated from the nuclear reaction 40Ca (n, α)37 Ar in the Ca-doped zircon. Since the intensity of the signal g=2.0083 in natural zircons is roughly proportional to their fission track age, it is probably caused by disintegration of radioactive elements in the zircons. The other signals with g=2.0001, 2.0010, 2.0018. and 2.0030. become stronger in intensity after the neutron and γ-ray irradiations.
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