Production and characterization of a custom-made 228Th source with reduced neutron source strength for the Borexino experiment

Maneschg, W.; Baudis, L.; Dressler, R.; Eberhardt, K.; Eichler, R.; Keller, H.; Lackner, R.; Praast, B.; Santorelli, R.; Schreiner, J.; Tarka, M.; Wiegel, B.; Zimbal, A. (2012). Production and characterization of a custom-made 228Th source with reduced neutron source strength for the Borexino experiment. Nuclear instruments & methods in physics research. Section A - accelerators, spectrometers, detectors and associated equipment, 680, pp. 161-167. Amsterdam: North-Holland 10.1016/j.nima.2012.04.019

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A custom-made 228Th source of several MBq activity was produced for the Borexino experiment for studying the external background of the detector. The aim was to reduce the unwanted neutron emission produced via (alpha,n) reactions in ceramics used typically for commercial 228Th sources. For this purpose a ThCl4 solution was converted chemically into ThO2 and embedded into a gold foil. The paper describes the production and the characterization of the custom-made source by means of gamma-activity, dose rate and neutron source strength measurements. From gamma-spectroscopic measurements it was deduced that the activity transfer from the initial solution to the final source was >91% (at 68% C.L.) and the final activity was (5.41+-0.30) MBq. The dose rate was measured by two dosimeters yielding 12.1 mSv/h and 14.3 mSv/h in 1 cm distance. The neutron source strength of the 5.41 MBq 228Th source was determined as (6.59+-0.85)/sec.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Eichler, Robert

ISSN:

0168-9002

Publisher:

North-Holland

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:27

Last Modified:

17 Mar 2015 21:10

Publisher DOI:

10.1016/j.nima.2012.04.019

Web of Science ID:

000304894600026

URI:

https://boris.unibe.ch/id/eprint/9802 (FactScience: 215587)

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