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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Controlling of the fibreboard's surface mass using gamma radiation backscattering technique
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Controlling of the fibreboard's surface mass using gamma radiation backscattering technique

机译：使用伽马辐射反向散射技术控制纤维板的表面质量

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摘要

In order to carry out the quality assurance of fibreboard's manufacture, (in wood manufacturing industry), controlling of the fibreboard's surface mass is required. World-wide, the usual radiometric gauges are based on gamma-ray transmission phenomena, using Am-241 radioactive sources or X-ray radiation produced by controlled energy generators. In this paper, a surface mass measuring method, based on gamma radiation backscattering of an Am-241 source is presented The radiometric performances ( measuring sensibility, relative errors due the statistical fluctuations) were compared with the radiometric performances of the transmission methods and the measuring field for which each method is better was determined. The study shows that in applications where the surface mass is between .3 - lg/cm~2 the backscattering method is the most suitable. Also among the benefits of the backscattering method is the possibility to develop a transducer with a single block structure; relatively low size and weight, and which use only one material side during investigation. The study results allowed the optimization of the measuring geometry (source- measured material- detector ) for the backscattering method in order to obtain maximum radiometric performances. In this way, was determined the optimal distance between transducer surface and material, for which: 1. the backscattered radiation intensity is maximum 2. the measuring signal dependency with this distances (that can have fluctuation during the technological process) is minimum. The paper also presents the transducer model TRTT - GG - 01 (developed for this application in our institute) and the technical performances, which are suitable for the technological requirements of the fibreboard's manufacture in the wood manufacturing industry.
机译：为了对纤维板的制造进行质量保证（在木材制造行业中），需要控制纤维板的表面质量。在全球范围内，常用的辐射计基于伽玛射线传输现象，使用Am-241放射源或受控能量发生器产生的X射线辐射。本文提出了一种基于Am-241辐射源的伽马辐射反向散射的表面质量测量方法。将辐射性能（测量灵敏度，统计波动引起的相对误差）与透射法和测量方法的辐射性能进行了比较。确定哪种方法更好的领域。研究表明，在表面质量在.3-lg / cm〜2之间的应用中，反向散射方法是最合适的。反向散射方法的优点还包括开发具有单个块结构的换能器的可能性。相对较小的尺寸和重量，并且在调查过程中仅使用一侧材料。研究结果允许针对后向散射方法优化测量几何形状（源测量的材料检测器），以获得最大的辐射测量性能。通过这种方式，确定了换能器表面与材料之间的最佳距离，为此：1.反向散射辐射强度最大； 2.具有该距离的测量信号依赖性（在工艺过程中可能会有波动）最小。本文还介绍了换能器型号TRTT-GG-01（在我所为此应用而开发）和技术性能，它们适合于木材制造业中纤维板制造的技术要求。

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