Naqvi A A, Khiari F Z, Liadi F A, Raashid M A, Isab A H
Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Appl Radiat Isot. 2016 Sep;115:61-66. doi: 10.1016/j.apradiso.2016.06.010. Epub 2016 Jun 14.
The variation in intensity of 1.78MeV silicon, 6.13MeV oxygen, and 2.22MeV hydrogen prompt gamma rays from soil samples due to the addition of 5.1, 7.4, 9.7, 11.9 and 14.0wt% water was studied for 14MeV incident neutron beams utilizing a LaBr3:Ce gamma ray detector. The intensities of 1.78MeV and 6.13MeV gamma rays from silicon and oxygen, respectively, decreased with increasing sample moisture. The intensity of 2.22MeV hydrogen gamma rays increases with moisture. The decrease in intensity of silicon and oxygen gamma rays with moisture concentration indicates a loss of 14MeV neutron flux, while the increase in intensity of 2.22MeV gamma rays with moisture indicates an increase in thermal neutron flux due to increasing concentration of moisture. The experimental intensities of silicon, oxygen and hydrogen prompt gamma rays, measured as a function of moisture concentration in the soil samples, are in good agreement with the theoretical results obtained through Monte Carlo calculations.
利用溴化镧铈γ射线探测器，研究了14MeV入射中子束作用下，土壤样品中添加5.1%、7.4%、9.7%、11.9%和14.0%重量百分比水分后，1.78MeV硅、6.13MeV氧和2.22MeV氢瞬发γ射线强度的变化。硅和氧产生的1.78MeV和6.13MeVγ射线强度分别随样品湿度增加而降低。2.22MeV氢γ射线强度随湿度增加。硅和氧γ射线强度随水分浓度降低表明14MeV中子通量损失，而2.22MeVγ射线强度随湿度增加表明由于水分浓度增加热中子通量增加。作为土壤样品中水分浓度函数测量的硅、氧和氢瞬发γ射线的实验强度，与通过蒙特卡罗计算得到的理论结果吻合良好。
