IR-RF dating of sand-sized K-feldspar extracts: A test of accuracy
Publication: Research - peer-review › Journal article – Annual report year: 2012
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IR-RF dating of sand-sized K-feldspar extracts: A test of accuracy. / Buylaert, Jan-Pieter; Jain, Mayank; Murray, A.S.; Thomsen, Kristina Jørkov; Lapp, Torben.
In: Radiation Measurements, Vol. 47, No. 9, 2012, p. 759-765.Publication: Research - peer-review › Journal article – Annual report year: 2012
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TY - JOUR
T1 - IR-RF dating of sand-sized K-feldspar extracts: A test of accuracy
AU - Buylaert,Jan-Pieter
AU - Jain,Mayank
AU - Murray,A.S.
AU - Thomsen,Kristina Jørkov
AU - Lapp,Torben
PY - 2012
Y1 - 2012
N2 - In this paper we use a recently developed radioluminescence (RL) attachment to the Risø TL/OSL reader to test the InfraRed-RadioFluorescence (IR-RF) dating method applied to K-feldspar rich extracts from our known-age archive samples. We present experiments to characterise the instrument performance and to test the reproducibility of IR-RF measurements. These experiments illustrate the high sensitivity and dose rate of our RL system, the negligible influence of the turntable movement on IR-RF signals and the effectiveness of the built in 395 nm LED at bleaching IR-RF signals. We measure IR-RF ages on a set of samples with independent age control using a robust analytical method, which is able to detect any possible sensitivity change. Our IR-RF ages do not agree well with the independent age control; the ages of the younger samples (20–45 ka) are significantly over-estimated while the ages of the older samples (∼130 ka) are significantly under-estimated. Experiments are undertaken to investigate this disagreement and our results indicate that they can most likely be explained by 1) the difficulty of defining the correct bleaching level prior to regeneration measurements, 2) signal instability, 3) sensitivity changes between the additive dose and regenerative dose measurements, or a combination of these three factors.
AB - In this paper we use a recently developed radioluminescence (RL) attachment to the Risø TL/OSL reader to test the InfraRed-RadioFluorescence (IR-RF) dating method applied to K-feldspar rich extracts from our known-age archive samples. We present experiments to characterise the instrument performance and to test the reproducibility of IR-RF measurements. These experiments illustrate the high sensitivity and dose rate of our RL system, the negligible influence of the turntable movement on IR-RF signals and the effectiveness of the built in 395 nm LED at bleaching IR-RF signals. We measure IR-RF ages on a set of samples with independent age control using a robust analytical method, which is able to detect any possible sensitivity change. Our IR-RF ages do not agree well with the independent age control; the ages of the younger samples (20–45 ka) are significantly over-estimated while the ages of the older samples (∼130 ka) are significantly under-estimated. Experiments are undertaken to investigate this disagreement and our results indicate that they can most likely be explained by 1) the difficulty of defining the correct bleaching level prior to regeneration measurements, 2) signal instability, 3) sensitivity changes between the additive dose and regenerative dose measurements, or a combination of these three factors.
KW - Infrared-RadioFluorescence (IR-RF)
KW - Accuracy
KW - K-feldspar
KW - Fading
KW - Sensitivity change
U2 - 10.1016/j.radmeas.2012.06.021
DO - 10.1016/j.radmeas.2012.06.021
M3 - Journal article
VL - 47
SP - 759
EP - 765
JO - Radiation Measurements
T2 - Radiation Measurements
JF - Radiation Measurements
SN - 1350-4487
IS - 9
ER -