J-PET探测器新型准直系统束流剖面研究
Beam profile investigation of the new collimator system for the J-PET detector
摘要：
Jagiellonian正电子发射断层扫描仪（J-PET）是一种多用途探测器，可用于探测正电子素原子衰变过程中的离散对称性破坏，并可用于生命科学和医学诊断中的正电子素原子研究。本文提出了三种确定准直湮灭γ量子束流轮廓的方法。精确监测该轮廓对于J-PET探测器的时间和能量校准以及用于命中时间和命中位置重建的模型信号库的确定至关重要。我们已经表明，使用两个尺寸为5 × 10 × 20 cm ^3的铅砖能够形成具有高斯轮廓的湮灭量子束，其特征在于1 mm的半高宽。该特性的确定对于24模块J-PET样机的准直系统的设计和制造是至关重要的。对不同准直器尺寸的光束轮廓进行了模拟。这使我们能够根据24模块J-PET探测器的设计，在准直器的射束轮廓参数、尺寸和重量方面选择最佳准直系统。
英文摘要：
Jagiellonian Positron Emission Tomograph (J-PET) is a multi-purpose detector which will be used for search for discrete symmetries violations in the decays of positronium atoms and for investigations with positronium atoms in life-sciences and medical diagnostics. In this article we present three methods for determination of the beam profile of collimated annihilation gamma quanta. Precise monitoring of this profile is essential for time and energy calibration of the J-PET detector and for the determination of the library of model signals used in the hit-time and hit-position reconstruction. We have we have shown that usage of two lead bricks with dimensions of 5x10x20 cm^3 enables to form a beam of annihilation quanta with Gaussian profile characterized by 1 mm FWHM. Determination of this characteristic is essential for designing and construction the collimator system for the 24-module J-PET prototype. Simulations of the beam profile for different collimator dimensions were performed. This allowed us to choose optimal collimation system in terms of the beam profile parameters, dimensions and weight of the collimator taking into account the design of the 24 module J-PET detector.
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