“INVESTIGATION OF CHANGES IN INDOOR RADON CONCENTRATIONS BEFORE AND AFTER SEISMIC ACTIVITIES IN GYEONGJU AND POHANG, KOREA”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 16, no. 56, pp. 98–103, Apr. 2019, Accessed: Jun. 28, 2026. [Online]. Available: https://geomatejournal.com/geomate/article/view/2679