An improved counting circuit
H P Barasch · Proceedings of the Physical Society · 1935
This paper deals with a simple Geiger-Müller counter circuit, the essential feature of which is the application of a special characteristic curve of a pentode valve. This { i a , e g } curve has a saturation portion in the negative grid region. The output pulses from the circuit are equalized, free from secondary disturbances, and of shortened duration. By means of an appropriate resistance-capacity coupling to the thyratrons a back pulse is generated, so that the final pulse-shape is more suitable for triggering the thyratrons. A description of the simple pentode circuit is given and also of a universal set, consisting of four valves, which is suitable for coincidence counting. The special characteristic curve when applied to the coincidence circuit leads to improved discrimination between total and partial coincidences.