Study of Radioactivity in Bajaur Norite Exposed in the Himalayan Tectonic Zone of Northern Pakistan

Radioactivity in Granites of Pakistan systematically increases from south to north. The Ambella Granite found at the northern edge is highly radioactive. measurements made on, so called, Bajaur Granite, located Pakistan, have been be lowest among all granitic rock area. In order find out exact nature rocks, mineralogical studies were carried on chips and powdered samples. Norite contains plagioclase feldspar more than 45% as chief constituent. Orthopyroxene clinopyroxene are 27% 18%. Quartz, biotite, some opaque minerals also accessory amounts. fact not a granite but Norite, which rich Na-Ca series feldspars. low radioactivity. Moreover, average gamma activities 226Ra, 232Th, 40K (4.98 ± 0.13 Bqkg −1, 4.03 0.31 204.40 4.72 −1 total three radionuclides 214.00 5.39 −1) for Norites too much less world’s Granites. Indoor outdoor hazard indices below building materials used throughout world largely beneath their criterion restrictions. As per radiations’ hazards concerned, stone may considered safest material available area that does pose any radiological hazard.