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Updated: Apr 14, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Development of a primary thoron activity standard for the calibration of thoron measurement instruments
B Sabot1, S Pierre2, P Cassette2
1CEA, LIST, LNHB, CEA Saclay, Gif-sur-Yvette F-91191, France Institut de Radioprotection et de Sûreté Nucléaire (IRSN) PSN-RES, SCA, LPMA, Centre de Saclay, Gif-sur-Yvette 91192, France benoit.sabot@cea.fr.
Abstract:
The LNHB and IRSN are working on a reference atmosphere for thoron ((220)Rn) instrument calibration. The LNHB, as the national metrology institute for activity measurement in France, has to create a new thoron reference standard in order to estimate with accuracy the thoron concentration of a reference atmosphere. The measurement system presented in this paper is based on a reference volume using an alpha detector, which is able to measure thoron and its decay products to define the thoron concentration of a thoron reference atmosphere. This paper presents the first results with this new system using a well-known radon ((222)Rn) atmosphere and a thoron ((220)Rn) atmosphere.
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