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

Kreutzer, S., Martin, L. , Guérin, G., Tribolo, C., Selva, P. and Mercier, N. (2018) Environmental dose rate determination using a passive dosimeter: techniques and workflow for α-Al2O3: C chips. Geochronometria, 45(1), pp. 56-67. (doi: 10.1515/geochr-2015-0086)

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).

• Item Type: Articles
• Additional Information: The work for this manuscript was supported by Region Nouvelle Aquitaine project "DAPRES_LA_FEM". This work received financial support by a programme supported by the ANR - n◦ ANR-10-LABX-52.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Martin, Dr Loic
• Authors: Kreutzer, S., Martin, L., Guérin, G., Tribolo, C., Selva, P., and Mercier, N.
• College/School: College of Science and Engineering > Scottish Universities Environmental Research Centre
• Journal Name: Geochronometria
• Publisher: Sciendo
• ISSN: 1733-8387
• ISSN (Online): 1897-1695
• Published Online: 21 February 2018
• Copyright Holders: Copyright © 2017 S. Kreutzer et al.
• First Published: First published in Geochronometria 45(1):56-67
• Publisher Policy: Reproduced under a Creative Commons license