NECTAR-A fission neutron radiography and tomography facility
NECTAR-A fission neutron radiography and tomography facility
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DOI：
10.1016/j.nima.2011.01.058
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发表时间：
2011-09-21
影响因子：
1.4
通讯作者：
Wagner, F. M.
中科院分区：
文献类型：
--
作者：
Buecherl, T.;von Gostomski, Ch Lierse;Wagner, F. M.
NETAR(中子计算机断层摄影和射线摄影)是一种用于射线照相和断层照相研究以及利用裂变中子进行中子活化实验的多功能设备。该设备的辐射源是位于FRM II慢化剂容器中的两块高浓缩铀。来自反应堆主要燃料元件的热中子在这些板中产生快中子。它们可以通过水平束管逃逸，而不会减慢。为了减少伴随的伽马辐射和匹配特定的实验任务，可以对束流进行过滤和操纵。总结了实验设置和(定量)数据评估所需的主要参数。给出了中子和伽马辐射的(测量)谱，以及不同滤光片对其行为的影响。文中还给出了实际使用的中子成像探测系统的中子和伽马通量、剂量率、L/D比值等主要参数。(C)2011爱思唯尔B.V.保留所有权利。
NECTAR (Neutron Computerized Tomography and Radiography) is a versatile facility for radiographic and tomographic investigations as well as for neutron activation experiments using fission neutrons.The radiation sources for this facility are two plates of highly enriched uranium situated in the moderator vessel in FRM II. Thermal neutrons originating from the main fuel element of the reactor generate in these plates fast neutrons. These can escape through a horizontal beam tube without moderation. The beam can be filtered and manipulated in order to reduce the accompanying gamma radiation and to match the specific experimental tasks.A summary of the main parameters required for experimental set-up and (quantitative) data evaluation is presented. The (measured) spectra of the neutron and gamma radiations are shown along with the effect of different filters on their behavior. The neutron and gamma fluxes, dose rates, L/D-ratios, etc. and the main parameters of the actually used detection systems for neutron imaging are given, too. (C) 2011 Elsevier B.V. All rights reserved.