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为了拓宽B—A计的测量下限,对一些商品B-A计作了改进.用发夹形灯丝代替商品B-A计中的螺旋形灯丝,对B—A计的灵敏度与灯丝位置的关系作了研究,文中给出了改进B—A计的特性,包括灵敏度与电极电压及灯丝位置的关系,为了有一确定的灵敏度及检测正向和反向X—射线光电流,该B—B计插入固一定内径的340LN不锈钢管中,证实了自调制完全可
In order to broaden the measurement limit of B-A meter, some products of BA were improved.With the hairpin-shaped filament instead of the spiral filament of the commercial BA meter, the relationship between the sensitivity of B-A and the position of the filament was studied, In this paper, the characteristics of the improved B-A meter are given, including the relationship between the sensitivity and the electrode voltage and the position of the filament. The B-B meter is inserted into a fixed inner diameter in order to have a certain sensitivity and to detect positive and negative X-ray photocurrents 340LN stainless steel tube, confirmed that the self-modulation can be completely