XAYHEUNGSY, S.; THANH, N. C.; NAM, L. D.; GIANG, V. H.; KHIEM, L. H. MEASUREMENT OF NATURAL RADIOACTIVITY IN SOME SAND AND BRICK IN VIETIANE PROVINCE, LAO PDR. IJRDO-Journal of Applied Science, v. 4, n. 11, p. 11-19, 30 Nov. 2018.