Miyahara H, Suzuki M, Watanabe T
Radioisotopes. 1978 Nov;27(11):625-30. doi: 10.3769/radioisotopes.27.11_625.
A thin 4 pi beta-counter with five anode wires was operated by supplying negative high voltage to the inner wall and showed good plateau characteristics in the case of using only the center anode to take out signals in the previous experiments. This counter, as the 4 pi beta-counter and both 2 pi beta-counters, showed good plateau characteristics in these detailed experiments and no dependency on the disintegration rates examined up to 6000 dps. Then a 4 pi beta-gamma coincidence equipment was set up using this 4 pi beta-counter and one NaI(T1) scintillation detector with size of 76 mmphi x 76 mm. The radioactivities that were measured for beta-gamma and electron capture-gamma decay nuclides by this coincidence equipment were coincided with those measured by the other one. The improvement of the gamma-ray detection efficiency to aim was achieved by that the efficiency obtained by this system was the same as one by the other system having two NaI(T1) detectors with the same size.
一个带有五根阳极丝的薄型4πβ计数器，通过向内壁施加负高压来运行，并且在之前的实验中，当仅使用中心阳极取出信号时，显示出良好的坪特性。在这些详细实验中，该计数器作为4πβ计数器和两个2πβ计数器，均显示出良好的坪特性，并且对高达6000 dps的检测衰变率没有依赖性。然后，使用这个4πβ计数器和一个尺寸为76 mmφ×76 mm的NaI(Tl)闪烁探测器搭建了一个4πβ-γ符合装置。该符合装置测量的β-γ和电子俘获-γ衰变核素的放射性与另一个装置测量的结果一致。通过该系统获得的效率与另一个具有两个相同尺寸NaI(Tl)探测器的系统的效率相同，从而实现了目标γ射线探测效率的提高。
