Development and Test of a Neutron Imaging Setup at the PGAA Instrument at FRM II

Söllradl, S; Mühlbauer, M.J.; Kudejova, P; Türler, Andreas (2015). Development and Test of a Neutron Imaging Setup at the PGAA Instrument at FRM II. Physics Procedia, 69, pp. 130-137. Elsevier 10.1016/j.phpro.2015.07.019

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We report on the developments of a neutron tomography setup at the instrument for prompt gamma-ray activation analysis (PGAA) at the Maier-Leibnitz Zentrum(MLZ). The recent developments are driven by the idea of combining the spatial information obtained with neutron tomography with the elemental information determined with PGAA, i.e. to further combine both techniques to an investigative technique called prompt gamma activation imaging (PGAI).At the PGAA instrument, a cold neutron flux of up to 6 x 1010 cm-2 s-1 (thermal equivalent) is available in the focus of an elliptically tapered neutron guide. In the reported experiments, the divergence of the neutron beam was investigated, the resolution of the installed detector system tested, and a proof-of-principle tomography experiment performed. In our study a formerly used camera box was upgraded with a better camera and an optical resolution of 8 line pairs/mm was achieved. The divergence of the neutron beam was measured by a systematic scan along the beam axis. Based on the acquired data, a neutron imaging setup with a L/D ratio of 200 was installed. The resolution of the setup was testedin combination with a gadolinium test target and different scintillator screens. The test target was irradiated at two positions to determine the maximum resolution and the resolution at the actual sample position. The performance of the installed tomography setup was demonstrated bya tomography experiment of an electric amplifier tube.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Türler, Andreas

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1875-3892

Publisher:

Elsevier

Language:

English

Submitter:

Franziska Bornhauser-Rufer

Date Deposited:

25 Jan 2016 11:41

Last Modified:

26 Jan 2016 18:11

Publisher DOI:

10.1016/j.phpro.2015.07.019

BORIS DOI:

10.7892/boris.74952

URI:

https://boris.unibe.ch/id/eprint/74952

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