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Residual hole concentration in recombination centres after bleaching

Pawlak N. K., Timar-Gabor A., Chruścińska A.

Geochronometria

2021

Vol. 48, no.1

415--427

Trapped charge dating method using electron spin resonance (ESR) of quartz is progressively used for sediment dating. ESR signals can be used for accurate age estimation only when these signals are zeroed by sunlight exposure before the layer creation or when one knows their ESR residual level (the part of the signal that is not bleached). It is well known that the ESR signal related to the Al-hole centres in quartz used for sediment dating has a significant residual signal. From the point of view of luminescence models, as a hole trap, the Al-hole centre is considered as a recombination centre in quartz. Recently, it was demonstrated experimentally that the ESR signal of the Al-hole centre is dependent on the total dose absorbed by the quartz sample in the past. The same effect was confirmed by simulations of the charge transport processes for a model including two recombination centres. Here, the dependence of residual hole concentration (RHC) in the recombination centres on the total dose absorbed by a sample in the past is studied in detail by computer simulations for a wide range of model parameters. The impact that the various relations of centre parameters have on the dependence of the residual as a function of dose is investigated and the implications for the dating practice are discussed.

Luminescencja izolatorów ceramicznych sieci energetycznych średnich napięć

Sobota R., Mandowski A., Mandowska E.

Elektronika : konstrukcje, technologie, zastosowania

2012

Vol. 53, nr 11

109-111

W pracy przedstawiono wyniki pomiarów termoluminescencji (TL) izolatorów ceramicznych sieci energetycznych średnich napięć. Materiał do badań pobrano z izolatorów pracujących wiele lat. Badano próbki pochodzące z różnych części izolatora. Zmierzono termoluminescencję naturalną oraz po napromienieniu promieniowaniem beta. W obu przypadkach otrzymano wyraźne piki termoluminescencyjne, powiązane ze strukturą defektową ceramiki.

The paper presents results of thermoluminescence (TL) measurements of ceramic insulators of medium-power energy networks. Samples for the measurements were taken from insulators working many years. The samples under study originated from different parts of insulator. Thermoluminescence was measured for natural samples as well as beta-irradiated. In both cases pronounced thermoluminescence peaks were obtained, related to defect structure of the ceramics.