标题： J-PET探测器单模块中伽马量子散射的模拟研究 显示英文标题

标题： Simulations of gamma quanta scattering in a single module of the J-PET detector

摘要： 本文描述了正电子湮没伽马射线在塑料闪烁体条带中的散射模拟。这种条带构成了新近提出的利用塑料闪烁体而非无机晶体的正电子发射断层扫描仪的基本探测模块。开发了一种模拟康普顿散射链的算法，并针对截面为 5 毫米 x 19 毫米的闪烁体条带进行了系列模拟。所得结果显示，只有大约 8% 的事件发生次级相互作用，而在这些事件中，仅有 25$\%$发生在距初级相互作用超过 0.5 厘米的距离处。此外还确定，初级和次级相互作用产生的光信号重叠，延迟分布的FWHM约为40皮秒。 显示英文摘要

摘要： This article describes simulations of scattering of annihilation gamma quanta in a strip of plastic scintillator. Such strips constitute basic detection modules in a newly proposed Positron Emission Tomography which utilizes plastic scintillators instead of inorganic crystals. An algorithm simulating chain of Compton scatterings was elaborated and series of simulations have been conducted for the scintillator strip with the cross section of 5 mm x 19 mm. Obtained results indicate that secondary interactions occur only in the case of about 8% of events and out of them only 25$\%$ take place in the distance larger than 0.5 cm from the primary interaction. It was also established that light signals produced at primary and secondary interactions overlap with the delay which distribution is characterized by FWHM of about 40 ps.