Moreno, B; Boso, A; Million, M; Taylor, G; Thomas, D (2022) ON ISO 21909-1:2015 and metrological performances of Landauer Neutrak-T dosimeter. Radiation Measurements, 150. 106699

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Abstract

Personal dosimetry for ionizing radiation is a regulated activity in Europe. More particularly in France, Individual Monitoring Services (IMS) are required to be accredited against ISO/IEC 17025 (1) for the personal dose equivalent measurements they perform . In the field of external personal dosimetry for ionizing radiations, there are no standardized methods for routine measurements of participants’ personal dose equivalent. Instead, the standards focus on defining protocols and associated acceptable performance limits for testing the measurement process. ISO Standard 21909 is the one related to passive neutron dosimetry systems (2) (3). This standard has been completely revised and its newest version has been published in 2015. The two versions of the standard are different in terms of methodology and performance limits. At the time the new version was written its effects on system compliance were unknown. LANDAUER provides individual monitoring services for ionizing radiation dosimetry worldwide. The service for neutrons is based on an internally developed dosimeter called Neutrak® which has two versions: Neutrak-J for fast neutrons and Neutrak-T for thermal and fast neutrons. The study described here focuses on the neutron dosimetry system as implemented at the Paris office. This system has been tested by the National Physical Laboratory against ISO 21909-1:2015. NPL is one of the few calibration laboratories able to cover the extensive series of tests required by the standard. The purpose of this paper is twofold. Firstly, it aims to present the differences between ISO 21909:2005 and ISO 21909-1:2015 for non-linearity, reproducibility, energy angle-dependency and fading. This illustrates the challenges arising from ISO 21909-1:2015 and should prove useful to other IMSs since, to the authors’ knowledge, the work described herein is the first of its kind. The second aim is to document the results of the type test of the LANDAUER neutron dose measurement process based on the Neutrak-T dosemeter.

Item Type:	Article
Keywords:	Neutron personal dosimetry
Subjects:	Ionising Radiation > Dosimetry
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.1016/j.radmeas.2021.106699
Last Modified:	02 Mar 2022 14:16
URI:	https://eprintspublications.npl.co.uk/id/eprint/9361