The determination of location and range of mined-out area by using Radon measurement method, according to the analysis of the geophysical and geochemical characteristics of radon, is discussed in this paper, and the satisfactory result was obtained when it was applied in Zhangcun coal mine.

Radon measurement is a geophysical radiometry.

In the program of reconnaissance of geothermy in Wang village Qi County,we tried to combine Rn measurement and magnetic prospecting to avoid undetermined or multiple explanation in the case of only one method was used to obtain more precise result.

This paper describes the basic principle of radon gas survey and, with an analysis of the result of radon survey performed over the known blocks in the Xiazhuang granite uranium orefield, illustrates the effectiveness of such survey in the prospecting for deep concealed uranium deposits.

Identifying the site of granite uranium deposit with radon survey and soil-natural themoluminescence survey——a case study of Xiazhuang granite uranium field;

Application of radon survey to engineering geology;

In order to eliminate the statistical fluctuation and random interference,this paper uses the multi-scale wavelet decomposition to analyze radon survey data so that the abnormal respond to the deep uranium mineralization can be subtracted.

he results of the radon measurement are affected by many factors, for instance, thehumiduty of the soil, the temperature in the detecting hole, climate, etc.

The results of ESR dating show that the fault is the late Pleistocene tectonic structure,while the on-site radon measurement shows that the ratio of the fault pulse peak value to the background value is relatively large and with relatively weak level of healing.

This paper briefly introduces the fundamental principle of radon gas measurement, the measuring results of the known work-out sections and the unkn own work-out sections shows that the radon gas measurement is an effective meth od to detect the work-out sections and has received excellent results in actual application.

It introduces the principles of the two geophysical methods of natural electric-field option channel and radon gas measurement,and through analyzing the measurement effect of gob and unknown area,it explains that it is the effective method of surface detection coal mine of combined geophysical method,to prompt the application of geophysical method in surface detection coal mine.