2006 Volume 55 Issue 2 Pages 55-60
Polystyrene is a main component of plastic scintillator, and it absorbs radon as well as liquid aromatic solvents. A new radon monitor was invented. The monitor detects radon which is distributed into plastic scintillator. A photomultiplier tube and plastic scintillator film were installed in a dark chamber, and radon water was introduced into the chamber. It was found that a scintillation spectrum of radon and daughters was observed. Then the radon concentration in water could be measured by use of plastic scintillator as an absorbent of radon. This method, APS: Absorptive Plastic Scintillation counting, is useful as a continuous monitor for radon in water.