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研究了一种容积为75ml的高灵敏的闪烁室,其探测效率～82％,本底计数率～0.09计数/min。研究提出了加温减压收集氡气的方法,从50ml射气管里收集氡气的回收率为99％。用该闪烁室和加温减压收集氡气的方法分析水中~(226)Ra,灵敏度可提高2—4倍,因而,在相同的测定条件下可明显地减少取样量。
A highly sensitive scintillation chamber with a volume of 75 ml was investigated with ~ 82% detection efficiency and a background count rate of ~ 0.09 counts / min. The study proposed a method of collecting radon by heating and reducing pressure, and the recovery rate of radon collected from a 50 ml air tube was 99%. Using this scintillation chamber and heating and decompression to collect radon gas, the sensitivity of ~ (226) Ra in water can be increased by 2-4 times. Therefore, the sampling volume can be obviously reduced under the same measurement conditions.