results of recent investigation on ground cracks by the radon (222Rn)
isotopic method in the southwest part of Bắc Bộ plain
Phenomena of recent ground cracks in the southwest part of Bắc Bộ Plain were investigated by radon isotopic method. The results show that occurrence of high radon anomalies revealed in the study area is closely related to the existence of these cracks.
High anomalous intensities of radon concentration revealed in the sudy area are greater than the radon background in range of 3-13 (in soil air) and 4.3 - 5.8 (in groundwater). They reflect recent ground cracks in the region.