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Cross-Calibration of an α-Source Used for Luminescence Dating by Applying Different Samples and Procedures

György Sipos
György Sipos
, 
Christoph Schmidt
Christoph Schmidt
, 
Tamás Bartyik
Tamás Bartyik
, 
Dávid Filyó
Dávid Filyó
, 
Gergő Magyar
Gergő Magyar
, 
Viktor Havasi
Viktor Havasi
 und 
Ákos Kukovecz
Ákos Kukovecz
   | 29. Juni 2021
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Article Category: Conference Proceedings of the 13th International Conference “Methods of Absolute Chronology” June 5–7th, 2019, Tarnowskie Gory, Poland
Online veröffentlicht: 29. Juni 2021
Seitenbereich: 61 - 72
Eingereicht: 30. Mai 2020
Akzeptiert: 12. Feb. 2021
DOI: https://doi.org/10.2478/geochr-2021-0003
Schlüsselwörter
© 2021 György Sipos et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig 1

Flowchart of procedures applied in the case of different cross-calibration approaches used in the study. (A) MAR measurements on α-irradiated aliquots from both laboratories. (B) α dose recovery of known α-doses using SAR. (C) α dose recovery of a known γ-dose using SAR. MAR, Multiple aliquot regeneration; SAR, Single aliquot regeneration.
Flowchart of procedures applied in the case of different cross-calibration approaches used in the study. (A) MAR measurements on α-irradiated aliquots from both laboratories. (B) α dose recovery of known α-doses using SAR. (C) α dose recovery of a known γ-dose using SAR. MAR, Multiple aliquot regeneration; SAR, Single aliquot regeneration.

Fig 2

MAR dose-response curves generated by the Szeged RISØ α-source with unknown dose rate and the normalised OSL/IRSL of calibration doses administered by the known dose rate Bayreuth Littlemore α-source. (A) quartz sample OSL, (B) polymineral sample first temperature IR50 and (C) polymineral sample pIRIR290. MAR, multiple aliquot regeneration; OSL, optically stimulated luminescence; pIRIR, Post-IR IRSL.
MAR dose-response curves generated by the Szeged RISØ α-source with unknown dose rate and the normalised OSL/IRSL of calibration doses administered by the known dose rate Bayreuth Littlemore α-source. (A) quartz sample OSL, (B) polymineral sample first temperature IR50 and (C) polymineral sample pIRIR290. MAR, multiple aliquot regeneration; OSL, optically stimulated luminescence; pIRIR, Post-IR IRSL.

Fig 3

Alpha SAR dose recovery of previously administered, incrementally increasing α-doses. Irradiation was made with the unknown dose rate Szeged α-source, while measurements were made at Bayreuth. SAR, Single aliquot regeneration.
Alpha SAR dose recovery of previously administered, incrementally increasing α-doses. Irradiation was made with the unknown dose rate Szeged α-source, while measurements were made at Bayreuth. SAR, Single aliquot regeneration.

Fig 4

Abanico plot (Dietze et al., 2016) of equivalent α-doses of the 4.81 Gy γ-dose carried by the RISØ calibration quartz, measured by the two readers at Szeged and Bayreuth.
Abanico plot (Dietze et al., 2016) of equivalent α-doses of the 4.81 Gy γ-dose carried by the RISØ calibration quartz, measured by the two readers at Szeged and Bayreuth.

Fig 5

Abanico plot (Dietze et al., 2016) of a-values concerning the RISØ calibration quartz and sample OSZ1107. Both datasets were measured at Szeged. The a-values are calculated by using the dose rate value determined by using the specific sample.
Abanico plot (Dietze et al., 2016) of a-values concerning the RISØ calibration quartz and sample OSZ1107. Both datasets were measured at Szeged. The a-values are calculated by using the dose rate value determined by using the specific sample.

Fig 6

Alpha dose-response curves of sample OSZ1107 and RISØ calibration quartz.
Alpha dose-response curves of sample OSZ1107 and RISØ calibration quartz.

Fig 7

Comparison of α- and β-dose-response curves measured at the two laboratories concerning (A) the RISØ calibration quartz and (B) sample OSZ1107. Effective α-dose stands for the β-dose equivalent of the α-dose administered, the conversion is made using the sample-specific a-value.
Comparison of α- and β-dose-response curves measured at the two laboratories concerning (A) the RISØ calibration quartz and (B) sample OSZ1107. Effective α-dose stands for the β-dose equivalent of the α-dose administered, the conversion is made using the sample-specific a-value.

Szeged a-source dose rates determined by different calibration procedures.

Sample Procedure Calculation Dose rate (Gy/s)
Quartz (OSZ 1107) MAR OSL OSLBAY → DαSZE(s) 0.071 ± 0.002
Polymineral (OSZ 1614) MAR IR50 DαSZE(s)=OSLBAY−bm {\rm{D}}_{\alpha {\rm{SZE}}{\left( s \right)}} = {{{\rm{OS}}{{\rm{L}}_{{\rm{BAY}}}} - b} \over {\rm{m}}} 0.109 ± 0.012
MAR pIRIR290 DαSZE*=DαBAY(s)DαSZE(s)DαBAY* {\rm{D}}_{\alpha {\rm{SZE}}}^* = {{{{\rm{D}}_{\alpha {\rm{BAY}}\left( {\rm{s}} \right)}}} \over {{{\rm{D}}_{\alpha {\rm{SZE}}\left( {\rm{s}} \right)}}}}{\rm{D}}_{\alpha {\rm{BAY}}}^* 0.085 ± 0.010
Quartz (OSZ 1107) α-SAR OSL DαSZE*=m {\rm{D}}_{\alpha {\rm{SZE}}}^* = {\rm{m}} 0.076 ± 0.004
α-dose recovery
RISØ quartz (Batch 108) α-SAR OSL DαSZE*=DαBAY(s)DαSZE(s)DαBAY* {\rm{D}}_{\alpha {\rm{SZE}}}^* = {{{{\rm{D}}_{\alpha {\rm{BAY}}\left( {\rm{s}} \right)}}} \over {{{\rm{D}}_{\alpha {\rm{SZE}}\left( {\rm{s}} \right)}}}}{\rm{D}}_{\alpha {\rm{BAY}}}^* 0.086 ± 0.005
γ-dose recovery

Environmental dose rates for the quartz and polymineral fraction of the same loess sample, calculated by applying the lowest and highest a-source dose rate received during the cross-calibration process.

226Ra (Bq/kg) 232Th (Bq/kg) 40K (Bq/kg) w (%) Depth (m) Mineral D*α-source (Gy/s) a-value D*α (Gy/ka) D*tot (Gy/ka)
34.7 ± 0.4 34.2 ± 0.6 390.9 ± 15.1 10 ± 2 0.9 Q 0.071 ± 0.002 0.041 ± 0.003 0.35 ± 0.04 2.89 ± 0.07
0.086 ± 0.005 0.034 ± 0.003 0.29 ± 0.03 2.83 ± 0.07
PM 0.071 ± 0.002 0.077 ± 0.003 0.65 ± 0.06 3.27 ± 0.09
0.086 ± 0.005 0.063 ± 0.004 0.54 ± 0.06 3.15 ± 0.08
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