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85748 Garching

FaNGaS

Fast Neutron-induced Gamma-ray Spectrometry

FaNGaS FaNGaS Schematic representation of FaNGaS © J. Feil (FRM II)

Schematic representation of FaNGaS © J. Feil (FRM II)

FaNGaS (Fast Neutron-induced Gamma-ray Spectrometry) is a new instrument at MLZ and has been developed in collaboration between Forschungszentrum Jülich and TUM.1
The instrument consists of an electro-mechanically cooled HPGe detector connected to a digital spectrometer for data acquisition and is surrounded by a complex shielding.2 FaNGaS is utilizing fission neutrons at the SR10 neutron beam port to induce gamma radiation for chemical analysis. The particularly large beam diameter at SR10 allows for irradiation of large objects. Non-destructive qualitative and quantitative elemental analysis is performed by use of prompt gamma irradiation that is induced by fission neutrons via nuclear reactions, such as (n,n’), (n,2n), (n,p) and (n,α).3

Selected applications
  • Irradiation of large samples (archeology, industry etc.)
  • Fundamental research (nuclear data, partial and total cross section measurements of different reactions etc.)
Technical data

Neutron Beam

  • Neutron collimator: 6cm diameter.
  • Multi-Leaf-Collimator, adjustable up to 27 × 19 cm2.
  • Typical beam size (sample size): 6 × 6 cm2.
  • Typical neutron flux: ~ 108, depending on filter.

Detector System und Data Acquisition

  • n-type HPGe detector with a relative efficiency of 50%, connected to a digital spectrometer (DSPEC-50 from ORTEC).
  • Detector cooling: CFG-X-COOL-III von ORTEC.
  • Detector shielding: BPE, PE und Pb.
  • Spectrum evaluation and calibration (non-linearity and efficiency) performed using the HYPERMET-PC Software.

References

[1] Rossbach, M., Genreith, C., Randriamalala, T. et al. J Radioanal Nucl Chem (2015) 304: 1359.
[2] T. Randriamalala et al., Nucl. Instum. Meth. A 806 (2016) 370-377
[3] A.M. Demidov, L.I. Govor, Yu.K. Cherepantsev, M.R. Ahmed, S. Al-Najjar, M.A. Al-Amili, N. Al-Assafi, and N. Rammo, “Atlas of Gamma-Ray Spectra from the Inelastic Scattering of Reactor Fast Neutrons”, Nuclear Research Institute, Baghdad, Iraq (Moscow, Atomizdat 1978).

Instrument scientists

Dr. Eric Mauerhofer
Phone: +49 (0)89 2461 61-3341
E-Mail: e.mauerhofer@fz-juelich.de

Dr. Zsolt Revay
Phone: +49 (0)89 289-12694
E-Mail: zsolt.revay@frm2.tum.de

PGAA
Phone: +49 (0)89 289-14906

Operated by

JCNS

MLZ is a cooperation between:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Geesthacht> Helmholtz-Zentrum GeesthachtForschungszentrum Jülich> Forschungszentrum Jülich

MLZ is a member of:

LENS> LENSERF-AISBL> ERF-AISBL

MLZ on social media:

The MLZ App – now available here! (Android)

MLZ App> MLZ App