Miyahara H, Suzuki M, Watanabe T
Radioisotopes. 1978 Aug;27(8):439-44. doi: 10.3769/radioisotopes.27.8_439.
A thin 4pibeta-multiwire proportional counter was constructed to increase the gamma-ray counting efficiency in the 4pibeta-gamma coincidence method. This counter with a counting volume of 70 X 60 X 11 mm and 5 wires in one half was made of an insulator and negative high voltage was supplied to the inner wall being possessed of conductivity. Then the anodes were operated at the earth potential and compact preamplifiers with no coupling condenser were fixed at the side of each half to miniaturize a shielding system for background. From the experimental results in various conditions, good characteristics were obtained in the case that signals were taken out from the center anode and the others were used only for cleaning up excess charges.
为提高4πβ -γ符合方法中的γ射线计数效率，构建了一个薄型4πβ多丝正比计数器。该计数器的计数体积为70×60×11毫米，一半有5根丝，由绝缘体制成，内壁具有导电性，向其施加负高压。然后阳极接地，每一半的侧面固定有不带耦合电容器的紧凑型前置放大器，以最小化本底屏蔽系统。从各种条件下的实验结果来看，当从中心阳极取出信号而其他阳极仅用于清除多余电荷时，获得了良好的特性。
