This paper introduces two types of sensitive charge preamplifier for Rn measure device, designing method, debugging process and performance; and it analyzes the conditions which can be applied.

• 摘要介绍了两种用于氡气测量装置的电荷灵敏前置放大器的实例，给出了设计思想、调试过程和技术指标，说明了它们不同的应用场合。