Newer response curves by Mares and Schraube (Nucl. A pulse-height analysis with background stripping is employed which provided a more accurate count rate for each sphere. We have extended a least-squares method of extracting neutron spectral information from Bonner-Sphere data which was previously developed by Zaidins et al. Calibration is then discussedĮxtraction of neutron spectral information from Bonner-Sphere data Spectral deconvolution methods are briefly reviewed, including derivative, parametric, quadrature, and Monte Carlo methods. The choice of the neutron detector for a Bonner sphere spectrometer is examined. The theory of neutron moderation and spectroscopy are briefly reviewed, and moderators that are useful for Bonner sphere spectrometers are discussed. (Author)Īpplications of Bonner sphere detectors in neutron field dosimetry The results obtained using 7 spheres were similar to those with the 5-in sphere, however is still in an information analysis stage. With these, the best and worst results were compared. The network topologies were trained 36 times for each case keeping constant the objective error (1E(-3)), the training algorithm was trains cg and the robust design methodology to determine the best network architectures. The performance of the network was compared using 7 Bonner spheres against other cases where only 2 and one sphere are used. For the design of the neural network we used the neutron spectra of the IAEA and the response matrix of the Bonner spheres with "6LiI(Eu) detector. The objective of this work was to reduce the number of Bonner spheres and to use counting speeds in a reverse propagation neural network, optimized by means of the robust design methodology, to reconstruct the neutron spectra. For the reconstruction of the spectra, different techniques such as artificial neural networks of reverse propagation have been used.
#HEX SHARDS OF FATE TAMING SPHERE CODE#
A.įor neutron spectrometry and neutron dosimetry, the Bonner spheres spectrometric system has been the most widely used system, however, the number, size and weight of the spheres composing the system, as well as the need to use a reconstruction code and the long periods of time used to carry out the measurements are some of the disadvantages of this system. Neutron spectrometry and dosimetry with neural networks and Bonner spheres: a study to reduce the spheres numberĮspinoza G, J. It is estimated that the integral neutron fluences and dose-equivalent values can now be determined with the Romanian spectrometer with uncertainties of about ±4% and Â☘%, respectively For further adjustments of the preliminary responses and for validation of the final fluence response matrix of the Romanian Bonner sphere spectrometer, calibration measurements with a reference 252 Cf neutron source and joint measurements, including the PTB Bonner sphere spectrometer, were performed in a few neutron fields differing substantially in their spectral distributions. By simple interpolations of the fluence responses of the PTB spheres, a preliminary fluence response matrix could be established for the IPNE Bonner sphere set. International Nuclear Information System (INIS)Īn existing set of Bonner spheres of the Institute for Physics and Nuclear Engineering in Bucharest has been modified following the PTB design for application of an 3 He-filled SP9 counter. Characterisation of the IPNE Bonner sphere spectrometer by comparison with the PTB system
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