用高密度介质中的过热超导颗粒（SSG）悬浮液（HDDM）作探测器的非晶态正电子发射断层成像可行性的初步研究
Preliminary Study of the Feasibility of a Non Crystalline Positron Emission Tomography Using a Suspension of Superheated Superconducting Grains (SSG) in High Density Dielectric Matrix (HDDM) as Detector
摘要：
过热超导颗粒的悬浮液是一种检测复合材料。悬浮液中的每一个颗粒都是一个微热计，其能量阈值由给定温度下的赤道磁场确定。基质密度越高，伽马阻止本领越大。几年来，这种悬浮液的圆柱形细胞长约2厘米，直径为0.4毫米，可以实时读出。因此，使用两个独立的细胞，可以记录它们之间的时间重合。这对于正电子照相机可能非常有用，其中两个直径相对的细胞同时被511 keV的伽马撞击。本文基于高密度矩阵中SSG的发展现状，讨论了这种可能性。
英文摘要：
Suspensions of superheated superconducting grains are a detecting composite material. Each grain in the supension is a microcalorimeter with an energy threshold defined by its equatorial magnetic field for a given temperature. The higher the matrix density, the larger the gamma stopping power. For several years, cylindrical cells of such suspensions about 2 cm long and 0.4 mm in diameter can be read out in real time. As a result, using two independent cells, one can record a time coincidence between them. This could be potentially very useful for positron cameras where two diametrically opposite cells are simultaneously knocked by 511 keV gammas. This paper, based on the state of art in SSG in high density matrix, discusses such a feasibility.
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