ZINC SULFIDE AS A SPECT SCINTILLATOR

硫化锌一直被认为是一种有效的闪烁体： Rutherford以粉末形式用于检测α粒子， 用于此目的。 在β刺激下，它也是上级的： 它是电视屏幕的通用蓝色磷光体。 粉末 然而，对于伽马射线探测器，闪烁器是不令人满意的，因为 吸收伽马射线所需的粉末材料的厚度 有效地产生光以致于几乎不透明。 如果硫化锌 可以以大的透明晶锭的形式生长， 高效率的伽马射线探测，特别是在80-300 keV 单光子发射计算机断层扫描（SPECT）所需的范围。 我们已经开发出一种用于生长高纯度的大型透明晶锭的方法， 带隙II-VI化合物。 初步结果显示，我们的未掺杂锌 硫化物晶锭在UV刺激下发光。 我们建议 研究了以最大化晶锭为目标银掺杂硫化锌晶体生长 在伽马射线刺激下的透明度和效率。 我们已经有一个 商业支持者，闪烁的领先公司之一， 领域，这是渴望评估我们的球与商业的目标， 应用.

Zinc sulfide has long been known as an efficient scintillator: it was used in powder form by Rutherford for detection of alpha particles and continues to be used for that purpose. Under beta stimulation it is also superior: it is the universal blue phosphor of television screens. Powder scintillators, however, are unsatisfactory for gamma ray detectors because the thickness of powdered material needed to absorb gamma rays scatters the generated light so efficiently as to be virtually opaque. If zinc sulfide could be grown in the form of large transparent boules, it would permit gamma ray detection with high efficiency, particularly in the 80-300 keV range required for Single Photon Emission Computed Tomography (SPECT). We have developed a process for growth of large transparent boules of high band gap II-VI compounds. Preliminary results show that our undoped zinc sulfide boules are luminescent under UV stimulation. We propose to investigate growth of silver-doped zinc sulfide, aiming at maximum boule transparency and efficiency under gamma ray stimulation. We already have a commercial supporter, one of the leading companies in the scintillation field, that is eager to evaluate our boules with the object of commercial applications.