论文部分内容阅读
用改进的坩埚下降法生长PbWO4:(Mo,Y)和纯PbWO4闪烁晶体。对切自毛坯晶体籽晶端的23mm×23mm×20mm六面抛光样品进行了吸收光谱、超短脉冲X射线激发荧光寿命、光产额和辐照损伤性能的测试。结果表明:Mo,Y双掺杂能显著增强PbWO4晶体的辐照硬度,在35Gy/h的剂量率下辐照24h后,纯PbWO4晶体的光产额变化率为52.4%,而PbWO4:(Mo,Y)晶体的光产额变化率仅为17.5%。Mo,Y双掺杂也改善了PbWO4晶体在350-420nm范围内的光学透过性能,并且PbWO4:(Mo,Y)晶体的平均发光衰减时间缩短为8.5ns,较之纯PbWO4晶体(15.2ns)更快。
PbWO4: (Mo, Y) and pure PbWO4 scintillation crystals were grown by an improved crucible down method. Absorption spectra, ultra-short pulse X-ray excitation fluorescence lifetime, light yield and radiation damage performance were measured on a 23 mm × 23 mm × 20 mm six-face polished sample cut from the seed crystal end of the blank. The results show that the doping of Mo and Y can significantly enhance the irradiation hardness of PbWO4 crystal, and the rate of change of light yield of pure PbWO4 crystal is 52.4% at the dose rate of 35Gy / h for 24 h, while PbWO4: (Mo , Y) crystal light yield rate of change was only 17.5%. Double doping of Mo and Y also improved the optical transmission properties of PbWO4 in the range of 350-420nm, and the average emission decay time of PbWO4: (Mo, Y) crystal was shortened to 8.5ns. Compared with pure PbWO4 crystal (15.2ns ) Faster.