de Lavison, P; Husband, L J; Jerome, S M; Keightley, J D; Woodman, A P; Woods, D H; Woods, S A (2000) The standardisation of 229Th for an environmental yield tracer. Appl. Radiat. Isot., 53. pp. 243-249.

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Abstract

The naturally occurring long-lived nuclides of thorium (228Th, 230Th and 232Th) arw all a-emitters that are of interest both to the nuclear and non-nuclear industries and levels of these nuclides need to be monitored in both the working and natural environment. In order to do this in a manner where the results of radiochemical analysis are traceable to national standards, a chemical yeild tracer has to be employed. 229Th has been identified as a suitable tracer for such purposes and has been used in the past. This paper describes the absolute standardisation of 229Th by 4pa- coincidence counting. The results of this work are presented together with an analysis of the standardisation uncertainties that were achieved in practice.

Item Type:	Article
Keywords:	radioactivity, standardisation, 229Th, yeild tracer
Subjects:	Ionising Radiation Ionising Radiation > Radioactivity
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2054

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