BONDI-97: A novel neutron energy spectrum unfolding tool using a genetic algorithm

Abstract The neutron spectrum unfolding procedure using the count rate data obtained from a set of Bonner sphere neutron detectors requires the solution of the Fredholm integral equation of the first kind by using complex mathematical methods. This paper reports a new approach for the unfolding of neutron spectra using the Genetic Algorithm tool BONDI-97 (BOnner sphere Neutron DIfferentiation). The BONDI-97 was used as the input for Genetic Algorithm engine EVOLVER to search for a globally optimised solution vector from a population of randomly generated solutions. This solution vector corresponds to the unfolded neutron energy spectrum. The Genetic Algorithm engine emulates the Darwinian “Survival of the Fittest” strategy, the key ingredient of the “Theory of Evolution”. The spectra of 241 Am / Be (α,n) and 239 Pu / Be (α,n) neutron sources were unfolded using the BONDI-97 tool.

[1]  L. ka,et al.  The effect of the choice of response matrix on neutron spectra unfolded from Bonner sphere data. , 1986 .

[2]  C. S. Sims,et al.  Neutron Spectral Measurements at ORNL , 1990 .

[3]  David E. Goldberg,et al.  Genetic Algorithms in Search Optimization and Machine Learning , 1988 .

[4]  Y Chen,et al.  A genetic algorithm approach to optimization for the radiological worker allocation problem. , 1996, Health physics.

[5]  John H. Holland,et al.  Adaptation in Natural and Artificial Systems: An Introductory Analysis with Applications to Biology, Control, and Artificial Intelligence , 1992 .

[6]  J. C. Liu,et al.  Measurements of Neutron Spectra at the Stanford Linear Accelerator Center , 1997 .

[7]  J. B. Martin,et al.  A least-squares technique for extracting neutron spectra from Bonner sphere data. , 1978, Medical physics.

[8]  Mamoru Akiyama,et al.  Optimization of wiggler magnets ordering using a genetic algorithm , 1992 .

[9]  M. Awschalom,et al.  Applications of Bonner Sphere Detectors in Neutron Field Dosimetry , 1985 .

[10]  T. Johnson,et al.  Modifications to recursion unfolding algorithms to find more appropriate neutron spectra. , 1984, Health physics.

[11]  Interpretation of the solution to the inverse problem for the positive function and the reconstruction of neutron spectra , 1985 .

[12]  Alexandru Agapie,et al.  A Genetic Algorithm for a fitting problem , 1997 .

[13]  J. T. Routti,et al.  Unfolding Activiation and Multisphere Detector Data , 1985 .

[14]  L. Moritz.  Measurement of neutron leakage spectra at a 500-MeV proton accelerator. , 1989, Health physics.