Dynamic neutron radiography instrumentation and applications in Central Europe
Dynamic neutron radiography instrumentation and applications in Central Europe
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动态中子射线照相仪器及其在中欧的应用
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发表时间：
2004
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通讯作者：
Mfirton BalaskC
中科院分区：
文献类型：
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作者：
Mfirton BalaskC
对近十年来在匈牙利布达佩斯和奥地利塞伯斯多夫研究堆建造的同步动态中子和伽马射线照相装置的特点进行了调查。对于图像检测，闪烁探测器和具有视频输出的微光电视摄像机被使用，从而提供了观察被调查对象内部中速运动的可能性。射线照相站已用于检测工业产品，目的是研究和开发。关键词：动态x光片；；内部结构;无损检测；流的可视化中子射线照相已被证明是无损检测研究中的一种有用工具，并且在各种应用中发挥着越来越大的作用（参见参考文献[1]和其中的参考文献）。该方法可用于可视化和分析封闭金属物体和管道系统中的流体流动、蒸发和冷凝过程。另一方面，通常需要伽玛射线和/或x射线照相来观察被研究物体内部的金属部分。这两种类型的辐射往往在不同的实验室中使用，即使某些研究需要同时应用这两种方法。当在实际操作中研究物体的内部结构时，动态射线照相检查尤其如此。我们认识到使用从同一来源获得的中子和伽马射线的可能性，即通过研究堆的热通道，我们已经建造了动态中子和伽马射线照相（DNGR）装置，适用于同时进行的DNGR工作。在本文中，我们描述了仪器的细节，然后提供了一些工业应用的例子。2. 1984年，在匈牙利布达佩斯的4.4 MW VVR-SM研究堆上建造了第一个适用于中子和伽马射线同时检查的DNGR装置[2,3]。随后,表1 DNGR主要特征的动态中子和伽马射线照相站在欧洲中部位置反应堆功率L / D通量Cd梁对象名称和(MW) [n厘米:s ']比直径尺寸类型(ram)(毫米X ram)对象体重(公斤)类型的辐射工作时间布达佩斯布达佩斯4.4 140 4×密度匈牙利VVR-SM Seibersdorf阿斯特拉8 150 6×I0的奥地利游泳池布达佩斯匈牙利布达佩斯I0 170我×I0 ~ VVR-SM我:7 14
Characteristic features of simultaneous dynamic neutron and gamma radiography installations built in the last ten years at the Budapest/Hungary and at the Seibersdorf/Austria research reactors are surveyed. For image detection scintillation detectors and a low-light level television camera with video output are used, thereby providing the possibility for visualizing medium speed movements inside the investigated object. The radiography stations have been used for inspecting industrial products, with the aim of research and development. Kevu'ords: Dynamic radiograph),; Internal structure; Non-destructix, e testing; Visualization of flow 1. I n t r o d u c t i o n Neutron radiography has proven to be a useful tool in non-destructive testing investigations, and its increasing role in various applications has been reported (see e.g. Ref. [1] and references therein). This method can be used to visualize and analyse the flow of fluids, the evaporation and the condensation processes in closed metal objects and tube systems. On the other hand, gamma and/or X-ray radiography is often needed to visualize the metallic parts inside the investigated object. The two types of radiation tend to be used in separate laboratories, even though certain investigations require the simultaneous application of the two methods. This is especially true for dynamic radiography inspections when the internal structure of an object is studied during actual operation. We recognized the possibility of using both neutron and gamma radiations obtained from the same source, i.e. through the thermal channel of research reactors, and we have constructed dynamic neutron and gamma radiography (DNGR) installations applicable lor simultaneous DNGR work. In this paper, we describe the details of the instrumentation and then provide some examples of industrial applications. 2. D y n a m i c r a d i o g r a p h y i n s t r u m e n t a t i o n The first DNGR installation applicable for simultaneous neutron and gamma radiography inspection was constructed in 1984 at the 4.4 MW VVR-SM research reactor in Budapest (Hungary) [2,3]. Subsequently, a DNGR Table 1 Main characteristics of dynamic neutron and gamma radiography stations in Central Europe Location Reactor Power L/D Flux Cd Beam Object name and [MW] [n cm : s '] ratio diameter dimension type [ram] [mm X ram] Object weight [kg] Type of radiation Working period Budapest Budapest 4.4 140 4 × ItY Hungary VVR-SM Seibersdorf ASTRA 8 150 6 × I0' Austria swimming pool Budapest Budapest I0 170 I × I0 ~ Hungary VVR-SM I : 7 14