A two-dimensional thermal-neutron detector developed for a small-angle diffractometer by the Petersburg Nuclear Physics Institute is described. The detector, with a sensitive area of 600 × 600 mm², is based on a multiwire proportional chamber. A gas mixture containing ³He is the neutron converter. A new technology for manufacturing electrodes has been developed and used to increase both the gas purity and the lifetime of the detector without refilling its working volume under the experimental conditions. Data acquisition is carried out by the readout system based on the method of cathode-strip data readout to an LC delay line, which is located inside the detector. The detector is operable in a vacuum owing to its design.

中文翻译：

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带有入口窗口600×600 mm的二维热中子探测器的开发

描述了由彼得斯堡核物理研究所为小角衍射仪开发的二维热中子探测器。该探测器的敏感区域为600×600 mm ²，基于多线比例腔。包含³ He的气体混合物是中子转换器。已经开发出一种用于制造电极的新技术，并用于提高气体纯度和检测器的寿命，而无需在实验条件下重新填充其工作体积。数据采集​​是由读出系统根据将阴极条数据读出到位于检测器内部的 LC 延迟线的方法进行 的。由于其设计，检测器可在真空中操作。