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Is there a common alpha-efficiency in polymineral samples measured by various infrared stimulated luminescence protocols?

Schmidt C., Bösken J., Kolb T.

Geochronometria

2018

Vol. 45, no. 1

160--172

Dating of polymineral silt-sized samples by use of post-infrared infrared stimulated luminescence (pIRIR) protocols at elevated temperature has recently gained attraction due to assumed lower rates of anomalous fading. The α-efficiency (or a-value) associated with the pIRIR signals as an integral part of age calculation has, however, not yet been sufficiently constrained. Here we present a set of 65 a-values determined for 47 samples collected across Europe with two different IRSL protocols in two laboratories. By testing the basic preconditions for application of the single-aliquot regeneration (SAR) procedure to constrain a-values and by comparing SAR results to a-values obtained by multiple-aliquot protocols, we demonstrate that SAR-derived a-values are reliable for the majority of samples. While aliquot size and signal resetting mode prior to α-regeneration do not appear to affect the resulting a-value, we detected significant differences in mean a-values measured in the two laboratories. For the pIRIR290 signal, a-values average to 0.085 ± 0.010 (Bayreuth) and 0.101 ± 0.014 (Cologne), while a modified SAR protocol yields 0.081 ± 0.008 (Bayreuth). Whereas provenance-specific differences in a-values might be masked by overall scatter, systematic offsets between laboratories are attributed to technical issues such as heater and source calibration. Based on the present data set, use of the same routine dating equipment is strongly advised for both dose and a-value measurements.

Przegroda szczelna wokół składowiska odpadów

Stępniak S., Kolb T.

Inżynieria i Budownictwo

2002

R. 58, nr 11

610-612

Opisano sposób wykonania przegrody otaczającej wyłączone z eksploatacji składowisko odpadów toksycznych w Munchehagen (Niemcy). Przegroda ma długość 1250 m, głębokość 30 m i grubość 80 cm. W pierwszej fazie wykonania wykop szczelinowy wypełniano zawiesiną tiksotropową, a w drugiej masą uszczelniającą, która po stężeniu stanowi przegrodę szczelną.

The execution method of the baffle surrounding depot of exluded waste toxic materials at Munchehagen (Germany) is described. The baffle is 1250 m long, 30 m deep and has thickness of 80 cm. The first step of works depends on execution of cavity excavations filled with thixotropic suspension which after putting special sealing pulp has developed hardening process of the filling, giving leakproof baffle.