Unfolding the fast neutron spectra of a BC501A liquid scintillation detector using GRAVEL method

Accurate knowledge of the neutron energy spectra is useful in basic research and applications. The overall procedure of measuring and unfolding the fast neutron energy spectra with BC501A liquid scintillation detector is described. The recoil proton spectrum of 241Am-Be neutrons was obtained experimentally. With the NRESP7 code, the response matrix of detector was simulated. Combining the recoil proton spectrum and response matrix, the unfolding of neutron spectra was performed by GRAVEL iterative algorithm. A MatLab program based on the GRAVEL method was developed. The continuous neutron spectrum of 241Am-Be source and monoenergetic neutron spectrum of D-T source have been unfolded successfully and are in good agreement with their standard reference spectra. The unfolded 241Am-Be spectrum are more accurate than the spectra unfolded by artificial neural networks in recent years.

[1]  S. Green,et al.  a comparison of neutron spectrum unfolding codes used with a miniature ne213 detector , 2001 .

[2]  H. Ohgaki,et al.  Photon spectrometry in thermal neutron standard field , 2002 .

[3]  Michael Heil,et al.  Pulse shape analysis of liquid scintillators for neutron studies , 2002 .

[4]  Hector Rene Vega-Carrillo,et al.  Neutron spectrometry using artificial neural networks , 2006 .

[5]  Sara A. Pozzi,et al.  Optimization of an Offline Pulse-Shape Discrimination Technique for the Liquid Scintillator BC-501A , 2006 .

[6]  M Shahriari,et al.  Unfolding the neutron spectrum of a NE213 scintillator using artificial neural networks. , 2009, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[7]  D. Cano-Ott,et al.  Analysis of the BC501A neutron detector signals using the true pulse shape , 2008 .

[8]  David J. Thomas,et al.  High resolution measurements of neutron energy spectra from AmBe and AmB neutron sources , 1995 .

[9]  H. Klein,et al.  Neutron and photon spectrometry with liquid scintillation detectors in mixed fields , 2002 .

[10]  M. Matzke,et al.  Unfolding of particle spectra , 1997, Other Conferences.

[11]  B. Wiegel,et al.  Characterisation of the IRSN CANEL/T400 facility producing realistic neutron fields for calibration and test purposes. , 2004, Radiation protection dosimetry.

[12]  R. Sanna,et al.  Monte-Carlo unfolding of neutron spectra , 1971 .

[13]  Sara A. Pozzi,et al.  Detector response unfolding using artificial neural networks , 2006 .

[14]  G. Knoll.  Radiation detection and measurement , 1979 .

[15]  Sara A. Pozzi,et al.  PULSE-SHAPE DISCRIMINATION FOR IDENTIFICATION OF NEUTRON SOURCES USING THE BC-501A LIQUID SCINTILLATOR , 2007 .

[16]  Marcel Reginatto,et al.  Spectrum unfolding, sensitivity analysis and propagation of uncertainties with the maximum entropy deconvolution code MAXED , 2002 .

[17]  H. Klein,et al.  Neutron spectrometry in mixed fields: NE213/BC501A liquid scintillation spectrometers. , 2003, Radiation protection dosimetry.

[18]  Bhaskar Mukherjee,et al.  BONDI-97: A novel neutron energy spectrum unfolding tool using a genetic algorithm , 1999 .

[19]  M Matzke,et al.  Unfolding of pulse height spectra : the HEPRO program system , 1994 .

[20]  J. Shao,et al.  Study of n-γ discrimination in low energy range (above 40 keVee) by charge comparison method with a BC501A liquid scintillation detector , 2014 .