Naslov
A comparative study of the luminescence characteristics of polymineral fine grains and coarse grained K-, Na- rich feldspars
(A comparative study of the luminescence characteristics of polymineral fine grains and coarse grained K- and Na- rich feldspars)

Autori
Tsukamoto, Sumiko ; Jain, Mayank ; Murray, Andrew S. ; Thiel, Christine ; Schmidt, Esther D. ; Wacha, Lara ; Dohrmann, Reiner ; Frechen, Manfred

Izvornik
Radiation measurements (1350-4487) 47 (2012), 9; 903-908

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
feldspar; polymineral; IRSL; post-IR IRSL; thermal stability; time-resolved IRSL

Sažetak
The IRSL and post-IR IRSL (pIRIR) signal characteristics of polymineral fine grains are investigated and compared with those of K- and Na- feldspar extracts. TL signal loss after IR and pIRIR stimulations occur mainly at around 320°C for polymineral and Na-feldspar samples and around 410°C for K-feldspar samples, when a preheat temperature of 250°C for 60s is used. After preheating to a higher temperature (320°C for 60s), all samples show a TL reduction around 410°C in the blue detection window. Pulse annealing experiments for IRSL and pIRIR signals for preheats between 320°C and 500°C indicate that the signal stabilities are similar among the different feldspar types, when a higher preheat temperature (> 320°C) is used. Thermal activation energies for IRSL and pIRIR signals is the largest in K- feldspar and the smallest in polymineral fine grains in both blue and UV detection windows for both fast time-resolved (TR) and continuous wave (CW) signals. These results suggest that IRSL and pIRIR signals in polymineral fine grains originate mainly from Na-feldspar grains ; these signals are less thermally stable than those from K-feldspar, but a more stable signal (presumably from K- feldspar grains) can be obtained by using a higher preheat temperature.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA