------ ﺍﻟﻤﺠﻠﺩ ﺍﻟﺭﺍﻓﺩﻴﻥ، ﻋﻠﻭﻡ ﻤﺠﻠﺔ19 ﺍﻟﻌﺩﺩ، 1 ﺹ، 134 - 143 ، 2008 ------ 134 ﻋﻴﻨﺎﺕ ﻓﻲ ﺍﻟﻁﺒﻴﻌﻲ ﺍﻹﺸﻌﺎﻋﻲ ﺍﻟﻨﺸﺎﻁ ﻗﻴﺎﺱ ﻤﻥ ﻟﻠﺒﻨﺎﺀ ﻜﻤﻭﺍﺩ ﺍﻟﻤﺴﺘﻌﻤل ﺍﻟﻤﺭﻤﺭ ﺭﺸﻴﺩ ﻤﺤﻤﻭﺩ ﻴﻭﺴﻑ ﺍﻟﻔﻴﺯﻴﺎﺀ ﻗﺴﻡ ﺍﻟﻌﻠﻭﻡ ﻜﻠﻴﺔ ﺍﻟﻤﻭﺼل ﺠﺎﻤﻌﺔ ) اﻻﺳﺘﻼم ﺗﺎرﻳﺦ4 / 7 / 2005 ، اﻟﻘﺒﻮل ﺗﺎرﻳﺦ26 / 11 / 2007 ( ﺍﻟﻤﻠﺨﺹ ﻋﻥ ﺍﻟﻨﺎﺠﻡ ﺍﻹﺸﻌﺎﻋﻲ ﺍﻟﺘﻠﻭﺙ ﻟﺘﺤﺩﻴﺩ ﺍﻷﻤﺩ ﻗﺼﻴﺭﺓ ﻗﻴﺎﺱ ﻁﺭﻴﻘﺔ ﺍﺴﺘﺨﺩﻤﺕ ﺍﻻﺸﻌﺎﻋﻲ ﺍﻟﻨﺸﺎﻁ ﻤﺼﺎﺩﺭ ﺍﻟﻁﺒﻴﻌﻲ, ﻋﺎﻟﻲ ﺠﺭﻤﺎﻨﻴﻭﻡ ﻜﺎﺸﻑ ﺒﻭﺍﺴﻁﺔ ﺍﻟﻁﺒﻴﻌﻴﺔ ﻜﺎﻤﺎ ﺃﺸﻌﺔ ﻁﻴﻑ ﻟﺘﺤﻠﻴل ﺍﻟﻨﻭﻭﻴﺔ ﺍﻟﺘﻘﻨﻴﺔ ﺍﺴﺘﺨﺩﻤﺕ ﺤﻴﺙ ﺍﻟﻤﺸﻌﺔ ﺍﻟﻨﻅﺎﺌﺭ ﻤﻥ ﺍﻟﻤﻨﺒﻌﺜﺔ ﻜﺎﻤﺎ ﺍﺸﻌﺔ ﺨﻁﻭﻁ ﻭﻴﻘﻴﺱ ﺍﻟﻨﻘﺎﻭﺓ. ﻤﻥ ﻟﻜل ﺍﻟﻨﻭﻋﻲ ﺍﻹﺸﻌﺎﻋﻲ ﺍﻟﻨﺸﺎﻁ ﺤﺩﺩ ﻭﻗﺩ ﺍﻟﻤﺸﻌﺔ ﺍﻟﻨﻅﺎﺌﺭ 238 U ﻭ 232 Th ﺍﻟﻤﺸ ﺍﻟﻨﻅﻴﺭ ﻭﻜﺫﻟﻙ ﻊ 40 K ﻋﺸﺭ ﺍﺤﺩ ﺸﻤﻠﺕ ﻭﺍﻟﺘﻲ ﺍﻟﻤﺩﺭﻭﺴﺔ ﺍﻟﻌﻴﻨﺎﺕ ﻓﻲ ﻟﻠﺒﻨﺎﺀ ﻜﻤﻭﺍﺩ ﻴﺴﺘﻌﻤل ﺍﻟﺫﻱ ﺍﻟﻤﺭﻤﺭ ﻤﻥ ﹰ ﻨﻭﻋﺎ. ــــــــــــــــــــــــــــــــــــــــــــــــــــــ Measurement of Natural Radioactivity in some Marble Samples used as Building Materials Rasheed M. Yousuf Department of Physics College of Science Mosul University ABSTRACT A comprehensive and short term method has been employed to determine the radioactive contamination from natural sources. So, the natural gamma ray spectrum analysis technique using HPGe have been used to measure the emitted gamma lines from the radioactive isotopes. The specific activity of 238 U, 232 Th series as well as 40 K was determined in the studied samples, which are consisted of eleven types of marble used as building material. ــــــــــــــــــــــــــــــــــــــــــــــــــــــ