Radon measurement activities and instruments designed at Studsvik Energiteknik AB

Two instruments for radon measurements, designated RM-1 and RM-3, have been designed at Studsvik Energiteknik AB. Both instruments are based on the same sampling technique, namely radon diffusion through a filter, followed by electrostatic collection of radon daughters produced by the radon that has penetrated the filter. The RM-1 is a long period integrating instrument whose radiation sensitive part is a thermoluminescent dosemeter, while the RM-3, which is a radon monitoring instrument, has a semi-conductor detector for alpha spectrometric measurement of the collected radon daughters. The features of the instruments are described, some relevant calibration data reported and a few comments on their application in different fields given. A summary of analysing activities at Studsvik is also presented concerning naturally radioactive elements, e.g. U, Th, Ra and Rn in various materials, radon exhalation from the ground and radon concentration in soil gas. (author)