TY - JOUR
T1 - Isolating a violet stimulated luminescence (VSL) signal in quartz suitable for dating
T2 - Investigating different thermal treatments and signal integration limits
AU - Ataee, Nina
AU - Roberts, Helen M.
AU - Duller, Geoff A.t.
N1 - Funding Information:
This research was conducted while NA was undertaking a PhD funded by an AberDoc Scholarship and a President's Scholarship awarded by Aberystwyth University . We are grateful to an anonymous reviewer and Alicja Chruscinska for their constructive comments which improved the paper.
Publisher Copyright:
© 2022 The Authors
PY - 2022/8/1
Y1 - 2022/8/1
N2 - The behavior of the post-blue violet stimulated luminescence (VSL) signal from quartz with respect to thermal treatments is explored. The results suggest that more than one source trap may be responsible for the VSL signal and therefore, the separation of this signal from the preceding blue stimulated luminescence (BSL) signal is challenging. Furthermore, the behavior of the VSL dose response curve (DRC) in a single aliquot regenerative (SAR) protocol is demonstrated to be influenced significantly by the test dose size and the efficacy of signal depletion prior to measurement of the test dose signal, and hence a modified VSL SAR measurement protocol is considered for further investigations in this study. The ability of this protocol to recover a given dose is tested and it is shown that by selecting different integration limits, two signals with distinct dose response characteristics can be separated from the same original VSL decay curve. Dose response curves derived from early signal integration (Signal A) saturate at ∼150 Gy and cannot recover given doses beyond this limit, whereas later signal integration (Signal B) results in a DRC that continues to grow exponentially to doses >> 500 Gy, and can recover given doses up to at least ∼3200 Gy. However, Signal B underestimates by ∼90% the equivalent dose (De) for a sample with expected De value of ∼500 Gy. This may suggest thermal instability of Signal B over geological time and needs further investigation.
AB - The behavior of the post-blue violet stimulated luminescence (VSL) signal from quartz with respect to thermal treatments is explored. The results suggest that more than one source trap may be responsible for the VSL signal and therefore, the separation of this signal from the preceding blue stimulated luminescence (BSL) signal is challenging. Furthermore, the behavior of the VSL dose response curve (DRC) in a single aliquot regenerative (SAR) protocol is demonstrated to be influenced significantly by the test dose size and the efficacy of signal depletion prior to measurement of the test dose signal, and hence a modified VSL SAR measurement protocol is considered for further investigations in this study. The ability of this protocol to recover a given dose is tested and it is shown that by selecting different integration limits, two signals with distinct dose response characteristics can be separated from the same original VSL decay curve. Dose response curves derived from early signal integration (Signal A) saturate at ∼150 Gy and cannot recover given doses beyond this limit, whereas later signal integration (Signal B) results in a DRC that continues to grow exponentially to doses >> 500 Gy, and can recover given doses up to at least ∼3200 Gy. However, Signal B underestimates by ∼90% the equivalent dose (De) for a sample with expected De value of ∼500 Gy. This may suggest thermal instability of Signal B over geological time and needs further investigation.
KW - D
KW - Dose recovery
KW - Equivalent dose
KW - Preheat
KW - Signal integration limits
KW - VSL
UR - http://www.scopus.com/inward/record.url?scp=85132442476&partnerID=8YFLogxK
U2 - 10.1016/j.radmeas.2022.106810
DO - 10.1016/j.radmeas.2022.106810
M3 - Article
SN - 1350-4487
VL - 156
JO - Radiation Measurements
JF - Radiation Measurements
M1 - 106810
ER -