重晶石混凝土中混入CRTs的屏蔽性能MC模拟研究

Study of Gamma-Ray Shielding Properties of Barite Concrete Including CRTs at Different Energies with Monte Carlo Method

基于MCNP5对重晶石混凝土中混入不同比例的报废阴极X射线管瓶锥部分的屏蔽性能进行模拟研究。通过对不同能量的γ射线穿过屏蔽体的模拟研究,得出四种能量的γ射线在各种比例混凝土中的出射光谱、线衰减系数、透射率及半吸收厚度。模拟结果表明:对于同一种能量的γ射线随着CRTs比例的上升,混凝土的屏蔽性能逐渐减弱,但半吸收厚度相差不超过1cm。研究结果为CRTs型混凝土应用于辐射防护领域的可行性提供了模拟实验支持,同时对新型屏蔽材料的研发提供了一定的参考,从而为报废阴极X射线管的回收利用开辟了新的市场,也为废弃物中重金属的污染提供了治理措施。

This paper compares the shielding capability of the concrete that is produced by mixing different proportion of the neck portion of the scrap color cathode X-ray tube into the barite concrete based on MCNP5.The exit spectrum,line attenuation coefficient,transmittance and half thickness of absorption of γ-rays with four kinds of energies（0.662 MeV、1 MeV、2 MeV、3 MeV） can be obtained from the simulation of these four γ-rays passing though the different concretes.The results suggest that the concrete＇s shielding capability is gradually weakened with the increase of the proportion of CRTs for the same energy γ-ray,but the half thickness of absorption will not exceed more than 1cm.The conclusion provides some supports on the application of CRT-concrete in radiation protection and offers some reference in the development of new shielding materials.Meanwhile,it not only opens new markets for the recycle of the scrap color cathode X-ray tube,but also provides some control measures for the pollution of heavy metal in the garbage.