Ce^(3+)激活的锂-6玻璃闪烁体发光及核物理性能的研究

选取Ce3+为激活剂离子,锂-6和硼-10为靶核核素分别研制了可用于热中子探测的玻璃闪烁体,并系统研究了其发光性能及部分核物理性能。研究结果表明,Ce3+激活的锂-6玻璃闪烁体具有较长的发射波长(390nm),较短的衰减时间(46.9ns)以及良好的γ射线甄别性能和温度效应,是探测热中子优良的玻璃基质材料。靶核核素与激活剂离子在锂-6玻璃闪烁体中均有一较佳的浓度范围,浓度过大将产生不同程度的淬灭效应。

Ce^3＋激活Li6-Al-Si玻璃闪烁体发光与核物理性能研究

合成了几种Ce^3＋与Li^6靶核核素共掺的Li—Al—Si系统玻璃闪烁体（简称LAS），系统研究了其稳态发光、瞬态发光及其主要核物理性能。研究结果表明：该玻璃闪烁体具有较长的发射波长、适中的Stokes位移、较短的衰减时间以及较高的中子探测效率，是中子探测优良的闪烁发光材料。利用Li^6和Li^7闪烁玻璃对中子和γ射线的响应特性，可实现中子和γ射线的甄别。

Comparison of thermal neutron detection ef f iciency of 6Li scintillation glass and 3He gas proportional tube

We report on a comparison study of the 3He gas proportional tube and the 6Li incorporated scintillation glasses on thermal neutron detection efficiency. Both 3He and 6Li are used commonly for thermal neutron detection because of their high neutron capture absorption coefficient. By using a neutron source 252Cf and a paraffin moderator in an alignment system, we can get a small beam of thermal neutrons. A flash ADC is used to measure the thermal neutron spectrum of each detector, and the detected number of events is determined from the spectrum, then we can calculate the detection efficiency of different detectors. Meanwhile, the experiment has been modeled with GEANT4 to validate the results against the Monte Carlo simulation.

锂-6玻璃闪烁体中Gd^(3+)-Ce^(3+)能量转移对发光性能的影响

研究了锂-6玻璃闪烁体中Gd3+引入对其发光性能的影响,结果表明:锂-6玻璃闪烁中Gd3+的引入存在Gd3+→Ce3+能量转移机制,有利于提高玻璃闪烁体的发光强度,Gd3+的引入同时提高了玻璃闪烁体的光碱度,使发射波长产生了相应的红移,Stokes位移变大;Gd3+在锂-6玻璃闪烁中较佳掺杂范围在15%左右,过高会产生相应的浓度淬灭效应,反而不利于玻璃闪烁体的发光。