VARIABILITY OF SOIL RADON ATTRIBUTED TO METEOROLOGICAL CAUSES AND ITSAPPLICATION

The meteorologic effects on soil radon is dealt with. The observations during a year at fixed locations show a clear pattern of seasonal var iations of soil radon which is grossly lower during spring and summer, lowest in summer, and higher during autumn and winter, highest in win ter. A fall of rain or show usually brings about a steep rise of soil radon concentration. At 0 degrees C or so, especially below 0 degrees C, radon values des cend greatly. Besides seasonal variations, soil ra don concentration also has, diurnal changes, with a pattern. of lower values at noon and higher values in the early morning and in the eveni ng. From the vertical profile, an optimum death for the measurement, w hich is 65-75 an, is recognized, where the radon value is maximal and diurnal variations are minimal. At last, measures are put forward to r educe or remove meteorologic effects on soil radon application.