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PbWO4闪烁晶体的辐照损伤机理研究

冯锡淇 韩宝国 胡关钦 张雁行

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PbWO4闪烁晶体的辐照损伤机理研究

冯锡淇, 韩宝国, 胡关钦, 张雁行

A STUDY ON RADIATION DAMAGE MECHANISM IN PbWO4 SCITILLATING CRYSTALS

FENG XI-QI, HAN BAO-GUO, HU GUAN-QIN, ZHANG YAN-XING
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  • 完成了640—1040℃温度范围内钨酸铅[PbWO4(PWO)]晶体的退火实验,观察到较低温退火时晶体中本征色心吸收带(350nm)先是增加,其后随退火温度的升高而逐渐降低直至消除的全过程.分析了PWO晶体的本征缺陷和电荷补偿机制.讨论了退火过程中氧进入晶体后色心的产生和转化规律,并提出可能发生Pb3+→Pb4+的进一步氧化过程,从而导致Pb3+空穴中心的湮没.测量并比较了不同退火温度处理后PWO晶体的紫外辐照诱导色心
    A representative PbWo4 sample was annealed subsequently from 640 to 1040℃ in air and the optical absorption spectra were measured after each annealing step. It was found that the intrinsic color center absortion band peaking at 350 nm increased after annealing at lower temperature, then with increasing annealing temperature it decreased continuously until it was removed finally. Based on the analysis of intrinsic defects and corresponding charge compensation of PbWO4 crystals, the creation and transformation of the color center were discussed. This was caused by the diffusion of oxygen, entering into PWO crystals during the annealing process. It was supposed that a Pb3+→Pb4+ transformation probably occurred in the annealing process, it would lead to annihilation of Pb3+ centers. The UV radiation induced color center absorptions of PWO crystals annealed at different temperatures were measured and compared. It has been observed that the O- hole centers as the main product of the radiation damage of PWO crystals were produced predominantly from the transformation of the intrinsic Pb3+ hole centers. On the other hand, oxygen vacancies VO as electron trap centers trapped the electrons during irradiatiion, thus stabilizing O- hole centers. When those two factors have been removed by means of annealing at high temperature in air(oxygen abundant atmosphere), the radiation hardness of PWO crystals can be effectively improved. While, the iron impurity in crystals is very harmful for the radiation hardness of PWO crystals.
    • 基金项目: 国家自然科学基金(批准号:59732040)资助的课题.
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  • 文章访问数:  6407
  • PDF下载量:  808
  • 被引次数: 0
出版历程
  • 收稿日期:  1998-10-16
  • 刊出日期:  1999-07-20

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