DETERMINATION OF DISSOLVED RADON AND RADI UM CONTENT OF WATER SAMPLESBY TRACK ETCH METHOD

We have developed a method to determine dissolved radon and radium con tent in water samples using track etch type radon monitors. The device is an immersed, small volume radon monitor with CR-39 track etch dete ctor. The monitor is sealed from the water by a thin radon permeable r ubber foil. The dissolved radon and/or the radium content of water sam ples can be determined from two independent radon exposures by using t he solutions of non steady state differential equation which describes the temporal variation of the radon content of water and by using an experimentally determined calibration coefficient.