This article describes a new concept of developing a composite plastic scintillator (PS) with better light out and detection efficiency of ionizing radiations by loading high Zeff radioluminescence (RL) phosphor powder. Gamma-ray interaction in PSs has been enhanced due to increased photoelectric absorption in the loaded BaFBr:Eu2+ phosphor powder. RL BaFBr:Eu2+ powder has been synthesized by a high-temperature solid-state diffusion method in reducing atmosphere. Polystyrene-based PS sheets of 250±50 μm thickness have been prepared with 2.5-diphenyl oxazole (PPO) and 1.4-bis(5-phenyl-2-oxazolyl) benzene (POPOP) as primary and secondary fluors, respectively, mixed with the synthesized phosphor powder in different weight percentages. Radiation detection properties of the composite PS have been studied for alpha, beta, neutron, and gamma radiations of different energies. The composite PS sheet loaded with 20 wt% of phosphor powder showed maximum intensity for RL and photoluminescence (PL). Studies also confirmed a significant increase in the radiation detection efficiency in composite PS for various energies of beta and gamma rays. The lifetime measurement of the composite PS showed same nanosecond lifetime which is appropriate for fast counting and matches closely with the PS without loading. Pulse height analysis for various ionizing radiations of different energies confirmed significant improvement in the detection efficiency of loaded PSs.

中文翻译：

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BaFBr:Eu磷钛辐射发光荧光粉负载塑料闪烁体的改进


本文介绍了一种新概念，即通过加载高 Zeff 辐射发光 (RL) 荧光粉来开发具有更好的光输出和电离辐射检测效率的复合塑料闪烁体 (PS)。由于负载的 BaFBr:Eu2+ 荧光粉粉末的光电吸收增加，PS 中的伽马射线相互作用得到增强。采用还原气氛下高温固相扩散法合成了RL BaFBr:Eu2+粉末。以2.5-二苯基恶唑（PPO）和1.4-双（5-苯基-2-恶唑基）苯（POPOP）分别作为初级和次级荧光体，与合成了不同重量百分比的荧光粉。复合PS的辐射探测特性已经针对不同能量的α、β、中子和γ辐射进行了研究。负载 20 wt% 荧光粉的复合 PS 片材显示出最大的 RL 和光致发光 (PL) 强度。研究还证实，复合 PS 对各种能量的 β 射线和 γ 射线的辐射检测效率显着提高。复合PS的寿命测量显示出相同的纳秒寿命，适合快速计数并且与无负载的PS密切匹配。对不同能量的各种电离辐射的脉冲高度分析证实了负载PS的检测效率显着提高。