Performance of NIRS Thoron Chamber System

摘要

In order to carry out thoron sensitivity test for passive radon detectors, a thoron chambersystem has been set up at NIRS, Japan. The thoron chamber system consists of four components:the exposure, monitoring, calibration, and humidity control systems, which was mounted in thisstudy due to humidity dependence on the thoron concentration emanated from lantern mantles asthe thoron source. The thoron concentration in the thoron chamber is controlled by humiditypassed through the thoron source and the weight of the lantern mantle.