Yb:YAG晶體性能實驗測量
發(fā)布時間:2018-01-19 22:59
本文關(guān)鍵詞: 時間寬度 Yb YAG晶體 衰減時間 發(fā)光光譜 相對發(fā)光效率 空間分辨 出處:《強激光與粒子束》2017年08期 論文類型:期刊論文
【摘要】:為了測量脈沖時間寬度小于20ns時的γ射線時間分辨圖像,發(fā)展了新型無機閃爍體Yb:YAG,并實驗測量了晶體的發(fā)光衰減時間、X射線激發(fā)發(fā)光光譜、相對發(fā)光效率和空間分辨等性能,研究了Yb:YAG晶體的發(fā)光性能。實驗表明,Yb:YAG發(fā)光有三種衰減成分,快成分衰減常數(shù)為1.2ns,慢成分衰減常數(shù)與射線種類有關(guān);X射線激發(fā)發(fā)光光譜在250~800nm范圍,有三個發(fā)光峰,分別為320,380和500nm,且320nm處強度最大;相對發(fā)光效率為1900ph/MeV;使用鎢分辨卡測得Yb:YAG空間分辨能力為2lp/m,使用刀口法測得空間調(diào)制傳遞函數(shù)為0.5時的頻率為0.7lp/mm。結(jié)果說明Yb:YAG晶體性能能夠滿足所需測量要求。
[Abstract]:In order to measure the 緯 -ray time-resolved images with pulse duration less than 20ns, a new inorganic scintillator, Yb: YAGG, was developed, and the luminescence decay time of the crystal was measured experimentally. The luminescence properties of Yb:YAG crystal have been studied by X-ray stimulated luminescence spectra, relative luminescence efficiency and spatial resolution. The experimental results show that there are three decay components in Yb: YAG luminescence. The fast component attenuation constant is 1.2 ns, and the slow component attenuation constant is related to the type of ray. The X-ray emission spectra are in the range of 250nm and 800nm, with three peaks of 320,380 and 500 nm, respectively, and the maximum intensity is at 320nm. The relative luminescence efficiency is 1900phr / MeV; The spatial resolution of Yb:YAG measured by tungsten resolution card is 2lp / m. When the spatial modulation transfer function is 0.5, the frequency is 0.7lp / mmm. the results show that the performance of Yb:YAG crystal can meet the requirement of measurement.
【作者單位】: 西北核技術(shù)研究所強脈沖輻射環(huán)境模擬與效應(yīng)國家重點實驗室;西安交通大學(xué)能源與動力工程學(xué)院;
【基金】:強脈沖輻射環(huán)境模擬與效應(yīng)國家重點實驗室基金項目(SKLIPR1405)
【分類號】:O734
【正文快照】: 輻射成像系統(tǒng)是射線測量中一種非常有效的工具,可以將高能脈沖輻射以及高能混合脈沖輻射的特性最終以數(shù)字化二維圖像顯示,從而可以對脈沖輻射源的強度及尺寸進行判斷1〗。為了測量輻射源強時間寬度較小(比如20ns)時的γ射線時間分辨圖像,要求輻射成像系統(tǒng)關(guān)鍵部件——閃爍體時
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