摘要
The meteorologic effects on soil radon is dealt with. The observations during a year at fixed locations show a clear pattern of seasonal variations of soil radon which is grossly lower during spring and summer, lowest in summer, and higher during autumn and winter, highest in winter. A fall of rain or snow usually brings about a steep rise of soil radon concentration. At 0℃ or so, especially below 0℃, radon values descend greatly. Besides seasonal variations, soil radon concentration also has diurnal changes, with a pattern of lower values at noon and higher values in the early morning and in the evening. From the vertical profile, an optimum depth for the measurement, which is 65-75 cm, is recognized, where the radon value is maximal and diurnal variations are minimal. At last, measures are put forward to reduce or remove meteorologic effects on soil radon in application.
The meteorologic effects on soil radon is dealt with. The observations during a year at fixed locations show a clear pattern of seasonal variations of soil radon which is grossly lower during spring and summer, lowest in summer, and higher during autumn and winter, highest in winter. A fall of rain or snow usually brings about a steep rise of soil radon concentration. At 0℃ or so, especially below 0℃, radon values descend greatly. Besides seasonal variations, soil radon concentration also has diurnal changes, with a pattern of lower values at noon and higher values in the early morning and in the evening. From the vertical profile, an optimum depth for the measurement, which is 65-75 cm, is recognized, where the radon value is maximal and diurnal variations are minimal. At last, measures are put forward to reduce or remove meteorologic effects on soil radon in application.
