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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Nested neutron spectrometer ： ウィキペディア英語版 Nested neutron spectrometer The nested neutron spectrometer (NNS) is a tool used for neutron spectroscopy. The NNS is used to measure the energy spectrum of neutrons in a neutron field. This type of detector is used in both research facilities (for characterization of neutron fields) and workplaces, where neutron radiation maybe encountered, for radiation protection purposes. Due to the difficulty associated with the detection of neutrons, the NNS is one of the few pieces of equipment capable of accurately determining the characteristics of a neutron field. == Principles of operation == The NNS operates under the same principle as a Bonner sphere neutron spectrometer.〔 〕 The sensitive part of the spectrometer is the Helium-3 proportional counter, which detects neutrons through the reaction 3He(n,p)3H. This particular reaction has a significant cross-section only at thermal neutron energies. In order for a higher energy neutrons to be detected their energies must be decreased, or "moderated". To slow down neutrons at higher energies the NNS uses different amounts of high-density polyethylene (HDPE). The He-3 proportional counter is surrounded by varying amounts of HDPE to sample various energy regions of the neutron field. The standard NNS has seven HDPE cylinders which are nested together, similar to Russian nesting dolls, to measure neutrons of higher and higher energies. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nested neutron spectrometer」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.