ISSN:
1573-8205
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
,
Physics
Notes:
Conclusions In quartz rocks E1 centers are formed in both paramagnetic and nonparamagnetic states under the effect of the natural background of ionizing radiation. Nonparamagnetic E1 centers go over into the paramagnetic state under the effect of heat on quartz (thermal activation of E1 centers). The rate of thermal activation depends on the absolute temperature of the specimen. Two subtypes of E1 centers differing as to the rate of thermal activation were detected. By quasilinear extrapolation in the coordinates (CE−C0)/(CM−C0)-t1/2 it was found that thermal activation of E1 centers of the first type, determined from the initial segments of the process, whould be completed at the usual temperature of 293°K (20°C) in ∼0.8·108 yr. Annealing of E1 centers of the first subtype in natural occurrence (at 293°K) is completed in 6.4·108 yr. The time for the completion of the thermal activation and annealing of E1 centers of the second subtype is roughly an order of magnitude longer than in the case of the first subtype. As a result of a long experiment (∼3 yr) it was established that at 423°K (150°C) the method of quasilinear extrapolation inables the thermal activation time to be estimated more accurately than does the barrier-activation theory usually employed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01123924
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