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可对硬X射线、γ射线等成像的旋转调制器(Rotating Modulator,RM)成像技术是一种探测效率高、能量范围宽、能量分辨能力高的技术,可满足核辐射监测中对高性能γ射线成像系统的需求。为此,研制了一台基于RM技术的γ射线成像系统样机。该样机主要包括一个由8条铅条组成的旋转准直器、7个NaI(Tl)探测器、步进电机和相应的读出及控制电路。样机视场角±14.6°,角度分辨率2°,在662 keV处能量分辨率为7%,对662 keVγ射线的探测效率达到22.2%。
Rotating Modulator (RM) imaging technology, which can image hard X-ray and γ-ray, is a high efficiency, wide range of energy and high energy resolution technology, which can meet the needs of high performance γ Radiography system needs. Therefore, a prototype of γ-ray imaging system based on RM technology has been developed. The prototype mainly consists of a rotating collimator composed of eight lead bars, seven NaI (Tl) detectors, a stepper motor and corresponding readout and control circuits. The prototype has a field angle of ± 14.6 °, an angular resolution of 2 °, an energy resolution of 7% at 662 keV, and a detection efficiency of 22.2% for 662 keV gamma rays.