Loading...

Evaluation of a new neutron energy spectrum unfolding code based on an adaptive neuro-fuzzy inference system (ANFIS)

Hosseini, S. A ; Sharif University of Technology | 2018

515 Viewed
  1. Type of Document: Article
  2. DOI: 10.1093/jrr/rrx087
  3. Publisher: Oxford University Press , 2018
  4. Abstract:
  5. The purpose of the present study was to reconstruct the energy spectrum of a poly-energetic neutron source using an algorithm developed based on an Adaptive Neuro-Fuzzy Inference System (ANFIS). ANFIS is a kind of artificial neural network based on the Takagi-Sugeno fuzzy inference system. The ANFIS algorithm uses the advantages of both fuzzy inference systems and artificial neural networks to improve the effectiveness of algorithms in various applications such as modeling, control and classification. The neutron pulse height distributions used as input data in the training procedure for the ANFIS algorithm were obtained from the simulations performed by MCNPX-ESUT computational code (MCNPX-Energy engineering of Sharif University of Technology). Taking into account the normalization condition of each energy spectrum, 4300 neutron energy spectra were generated randomly. (The value in each bin was generated randomly, and finally a normalization of each generated energy spectrum was performed). The randomly generated neutron energy spectra were considered as output data of the developed ANFIS computational code in the training step. To calculate the neutron energy spectrum using conventional methods, an inverse problem with an approximately singular response matrix (with the determinant of the matrix close to zero) should be solved. The solution of the inverse problem using the conventional methods unfold neutron energy spectrum with low accuracy. Application of the iterative algorithms in the solution of such a problem, or utilizing the intelligent algorithms (in which there is no need to solve the problem), is usually preferred for unfolding of the energy spectrum. Therefore, the main reason for development of intelligent algorithms like ANFIS for unfolding of neutron energy spectra is to avoid solving the inverse problem. In the present study, the unfolded neutron energy spectra of 252 Cf and 241 Am- 9 Be neutron sources using the developed computational code were found to have excellent agreement with the reference data. Also, the unfolded energy spectra of the neutron sources as obtained using ANFIS were more accurate than the results reported from calculations performed using artificial neural networks in previously published papers. ©The Author(s) 2018. Published by Oxford University Press on behalf of The Japan Radiation Research Society and Japanese Society for Radiation Oncology
  6. Keywords:
  7. 241 Am- 9 Be ; 252 Cf ; ANFIS ; Neutron energy spectrum ; Neutron pulse height distribution ; Unfolding ; Americium-241 ; Algorithm ; Artificial neural network ; Neutron ; Algorithms ; Americium ; Computer simulation ; Fuzzy logic ; Light ; Neural networks (computer) ; Neutrons
  8. Source: Journal of Radiation Research ; Volume 59, Issue 4 , 2018 , Pages 436-441 ; 04493060 (ISSN)
  9. URL: https://academic.oup.com/jrr/article/59/4/436/4812636