利用一种可带静电的塑料薄膜收集氡子体,然后测量其放射性活度浓度。为了提高测试精度首先设计了双光电倍增管或双金硅面垒对接结构,对取样塑料薄膜进行双面测试,而且光电倍增管面积相对塑料薄膜要足够大,距离尽可能的小,α粒子穿透率较高(实际穿透率达到89%),从而可将呈球面辐射的α粒子转换为电脉冲,实现高精度α粒子计数测量。实验结果表明:基于该探测器的测氡仪器具有体积小,成本低,灵敏度高,操作简单,测试速度快等优点。 Radon progeny were collected using an electrostatically-charged plastic film and their radioactivity concentration was measured. In order to improve the test accuracy, a double photomultiplier tube or a bimetallic face-to-face butt-joint structure is designed first, and a double-sided test is performed on the sampled plastic film. The area of ​​the photomultiplier tube is large enough relative to the plastic film to be as small as possible. Higher penetration (up to 89% actual penetration) allows the conversion of spherical alpha particles into electrical pulses for high-precision alpha particle counting. The experimental results show that the radon-measuring instrument based on the detector has the advantages of small size, low cost, high sensitivity, simple operation and fast testing.