KJD-2000R测氡仪（α谱仪）是一种新的氡观测仪器，通过观测下关温泉水中氡含量，与传统水氡观测仪器FD-125型室内氡钍分析器进行平行对比，对影响KJD-2000R测氡仪观测结果的可能因素进行分析，取得一些有意义的结论。

 KJD-2000R analyzer is a new- style α-particle detector for radon observing, We firstly use it to do monitoring radon from water sample in Xiaguan hot spring and compare results with those derive from traditional FD-125 indoor Radon-Thorium analyzer. Through a series of parallel contrastive observation,  we try to test and analyze those factors which can affect the final observing results and give some empirical suggestions for coming use.