新型大面积宇宙射线缪子成像检测装置研制

Development of A New Tomography Detection Device with Cosmic Ray Muon

研制了一套基于漂移管探测器的大面积宇宙射线缪子成像检测装置.该装置由6层交叉排列的漂移管探测器阵列构成.探测阵列面积2.2 mx2.2 m,探测位置精度好于0.9 mm,采用自触发符合技术使探测效率达到90%以上.对Al、Fe、W三种不同物质进行了成像实验和散射角计算,能够有效区分检测物.又对屏蔽盒内的铁块及钨块进行了成像,结果表明能够对屏蔽下的高原子序数物质进行区分.对钨字符块进行了8 h成像实验,得到了较为清晰的图像,能够分辨字符块形状.

A set of large-area imaging detection device using cosmic ray muon based on drift tube detector was developed.The device consists of 6 detector layers of cross-arranged drift tubes.The detection array area is 2.2 m×2.2 m,the position accuracy is better than 0.9 mm,and the detection efficiency reaches more than 90%using self-triggering coincident technology.Imaging experiments and scattering angle calculations were carried out on three different substances,Al,Fe and W,which can be effectively distinguished.The iron block and tungsten block in the shielding box were also imaged,and the results showed that the high Z materials wrapped by the shielding could be distinguished.Imaging experiments were performed on the tungsten character block,and a clear image was obtained within 8 h,the shape of the character block could be distinguished.