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The effects of using aliovalent doping in cerium bromide scintillation crystals.

机译：在溴化铈闪烁晶体中使用异价掺杂的影响。

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摘要

Strengthening the crystal lattice of lanthanide halides, which are brittle, anisotropic, ionic crystals may increase the availability and ruggedness of these scintillators for room-temperature gamma-ray spectroscopy applications. Eight dopants for CeBr3, including CaBr2, SrBr2, BaBr2, ZrBr4, HfBr4, ZnBr 2, CdBr2, and PbBr2, were explored at two different doping levels, 500ppm and 1000ppm, in an effort to identify potential aliovalent strengthening agents which do not adversely affect scintillation performance. All dopants and doping levels exhibited improved ingot yields over the undoped case, indicating an improvement in the ease of crystal growth.;Scintillation performance was gauged using four key metrics. Scintillation emission spectra or, rather, radioluminescence spectra were recorded using x-ray irradiation. Total light yield was estimated through pulse height comparison with bismuth germanate (BGO) scintillators. Scintillation kinetics were checked by measuring single interaction pulses directly output by a fast response PMT. Finally, light yield proportionality was measured using a Compton coincidence system.;Samples from each ingot were harvested to benchmark their performance with the four metrics. Of the eight dopants explored, only BaBr2 and PbBr2 clearly altered scintillation spectral emission characteristics significantly. The remaining dopants, CaBr2, SrBr2, ZrBr4, HfBr4, CdBr2 and ZnBr2, altered scintillation performance to a lesser degree. No dopant appeared to affect light yield proportionality, nor did any drastically alter the light decay characteristics of CeBr3. HfBr4 and ZnBr 2-doped CeBr3 exhibited the highest light yields, significantly higher than the undoped CeBr3 samples tested.;Finally, aliovalent doping appeared to greatly improve CeBr3 ingot yields, regardless of the dopant, thus it is a promising method for improving crystal strength while not deleteriously affecting scintillation performance. HfBr4 and ZnBr2 both demonstrated high performance without any noticeable negative side-effects and are prime candidates for future study.
机译：增强镧系卤化物的晶格是易碎的，各向异性的离子晶体，可以提高这些闪烁体在室温伽马射线光谱学应用中的可用性和坚固性。为研究CeBr3的八种掺杂剂，包括CaBr2，SrBr2，BaBr2，ZrBr4，HfBr4，ZnBr 2，CdBr2和PbBr2，在500ppm和1000ppm两种不同的掺杂水平下进行了研究，旨在确定不会不利影响的潜在铝价增强剂。闪烁性能。与未掺杂的情况相比，所有掺杂剂和掺杂水平均显示出提高的晶锭产率，表明晶体生长的容易性得到了改善。闪烁性能使用四个关键指标进行评估。使用X射线辐照记录了闪烁发射光谱，或者说是放射致发光光谱。通过与锗酸铋（BGO）闪烁体的脉冲高度比较来估算总光产量。通过测量由快速响应PMT直接输出的单个相互作用脉冲来检查闪烁动力学。最后，使用康普顿重合系统测量了光的输出比例。从每个铸锭中采集样品，以这四个指标对它们的性能进行基准测试。在探索的八种掺杂物中，只有BaBr2和PbBr2明显改变了闪烁光谱的发射特性。其余的掺杂剂CaBr2，SrBr2，ZrBr4，HfBr4，CdBr2和ZnBr2在较小程度上改变了闪烁性能。似乎没有掺杂剂影响光产率的比例，也没有大幅度改变CeBr3的光衰减特性。 HfBr4和ZnBr 2掺杂的CeBr3表现出最高的光产率，显着高于未测试的CeBr3样品。最后，不论掺杂物如何，异价掺杂似乎都可以显着提高CeBr3铸锭的产率，因此它是提高晶体强度的一种有前途的方法同时不会对闪烁性能产生有害影响。 HfBr4和ZnBr2均显示出高性能，并且没有任何明显的负面影响，是未来研究的主要候选对象。

著录项

  • 作者

    Harrison, Mark J.;

  • 作者单位

    Kansas State University.;

  • 授予单位 Kansas State University.;
  • 学科 Engineering Nuclear.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 152 p.
  • 总页数 152
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子能技术;工程材料学;
  • 关键词

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