Development of Moderator Based Neutron Spectrometer Rasito1,2, Sidik Permana1, Zaki Su^ud1, Alan Maulana2, and Putu Sukmabuana2
1Nuclear Engineering Department, Bandung Institute of Technology, Jl. Ganeca 10, Bandung, Indonesia
2Research Organization for Nuclear Energy, National Research and Innovation Agency, Jl. Tamansari 71, Bandung, Indonesia
Abstract
The single moderator neutron spectrometer is a neutron spectrometer development by modifiying multisphere technique. Multisphere is a moderator-based neutron spectrometer technique to measure the spectrum with the most comprehensive energy range from eV to GeV. The development aims to obtain a more practical device in mobility and technical measurement than multisphere. The development of a single-moderated neutron spectrometer in the aspect of moderator geometry has resulted in two types: spherical and cylindrical shapes. The spherical shape is applied to measure the multi-directional neutron beam, while the cylindrical shape is used for the one-way beam measurement. Therefore, compared to cylindrical, spherical shape requires more neutron detectors. Furthermore, the developments in the aspect of the applied detector have used active and passive type detectors. The active type of detector is used to measure intermediate flux neutrons, with the detector materials used generally being scintillator and gas ionizer. The passive type is usually used for measuring high or very low flux neutrons, with the detector materials used being dosimeter and activation. The validation results of 2.5% - 3.2% of single sphere and 2% - 8% of single cylinder show that the single-moderated neutron spectrometer design is sufficient to replace the multisphere type spectrometer.
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