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Environmental dose rate determination using a passive dosimeter: Techniques and workflow for α-Al2O3:C chips

Authors :
Loïc Martin
Pierre Selva
Sebastian Kreutzer
Norbert Mercier
Guillaume Guérin
Chantal Tribolo
IRAMAT-Centre de recherche en physique appliquée à l’archéologie (IRAMAT-CRP2A)
Institut de Recherches sur les Archéomatériaux (IRAMAT)
Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)
Source :
Geochronometria, Geochronometria, Sciendo, 2018, 45 (1), pp.56-67. ⟨10.1515/geochr-2015-0086⟩
Publication Year :
2018
Publisher :
HAL CCSD, 2018.

Abstract

In situ dosimetry (active, passive dosimeters) provides high accuracy by determining environmental dose rates directly in the field. Passive dosimeters, such as α-Al2O3:C, are of particular interest for sites with desired minimum disturbance (e.g., archaeological sites). Here, we present a comprehensive approach obtaining the environmental cosmic and γ-dose rate using α-Al2O3:C chips. Our procedure consists of (1) homemade field containers, (2) a homemade bleaching box, (3) a rapid measurement sequence and (4) software based on R to process the measurement results. Our validation steps include reproducibility, irradiation time correction, cross-talk evaluation and source calibration. We further simulate the effect of the container against the infinite matrix dose rate, resulting in attenuation of ca. 6%. Our measurement design uses a lexsyg SMART luminescence reader equipped with green LEDs. The irradiation is carried out under the closed β-source. The minimum dose that can be determined was estimated with ca. 10 μGy. However, we also show that for the equipment used, an irradiation time correction of ca. 2.6 s is needed and irradiation cross-talk should be taken into account. The suggested procedure is cross-checked with four reference sites at Clermont-Ferrand showing a good γ-dose rate for three out of the four sites. Finally, an application example, including needed analytical steps, is presented for dosimeters buried at the archaeological site of the Sierra de Atapuerca (Spain).

Details

Language :
English
ISSN :
17338387 and 18971695
Database :
OpenAIRE
Journal :
Geochronometria, Geochronometria, Sciendo, 2018, 45 (1), pp.56-67. ⟨10.1515/geochr-2015-0086⟩
Accession number :
edsair.doi.dedup.....bdea3ead033c806acf0a6a0725b21fd3
Full Text :
https://doi.org/10.1515/geochr-2015-0086⟩