【摘要】 由241Am-Be源、ZnS探测器和微机多道谱仪等组成的实验装置,测量了聚乙烯厚度的透射中子计数,同时应用蒙特卡洛MCNP/4C程序,分别计算了单层铁板代替管道、双层铁板代替管道、无保温层圆形输油管道以及有保温层圆形输油管道四种情况下,不同源距时油垢厚度对透射快中子计数的响应(灵敏度),实验和模拟结果显示随着源距的增加,测量灵敏度在下降。更多还原

【Abstract】 A set of transmission neutron counts corresponding to different polyethylene thicknesses was obtained by using an experiment setup,which consists of 241Am-Be source,ZnS detector,and computer multi-channel spectrometer,and gives the simulation results of the MCNP/4C method,which simulated the response relation(sensibility) between transmitted neutron counts and grease stain thickness in monolayer iron plate instead of the pipeline,double deck iron plates instead of the pipeline and a pipeline without or with thermal insulation layer under different source-distances.The experimented and simulated results show that the sensibility fall with the increase of source-distances.更多还原