A team of researchers from汉阳大学，首尔有3D打印的塑料闪光灯，能够以高效的方式检测伽马辐射。DLP打印的零件已针对市售的闪烁体BC408进行了测试，并且该团队发现他们的创造表现出相似的衰减时间和内在的检测效率。研究人员现在想进一步开发研究并制定一种新的树脂食谱，该食谱在存在伽马射线的情况下创建具有高密度和更高检测效率的部分。
塑料闪光灯
A scintillator is quite simply an instrument for detecting and measuring ionizing radiation. It relies on the excitation effect of incident radiation on a scintillating material, whereby the material gives off visible light in the presence of ionizing rays. The resultant pulses of light can be precisely measured to give an indication of the amount of radiation in the vicinity.
当使用具有较低检测效率的材料时，首选解决方案就是使用较大的表面积，因为这可以弥补损失的发光。一定的一点之后，这确实变得笨拙且不切实际，因此要找到中间立场。
过去，研究人员实际上在制造塑料闪光灯来进行辐射检测目的时使用了3D打印。不幸的是，这些闪烁体很少与市售的闪烁体相匹配，当并排比较时，该地区的效率约为70％。尽管如此，设计自由，多物质能力，节省时间和低成本仍使得值得研究。
DLP for radiation detection
The team started off by formulating the special recipe for the scintillating photopolymer resin. They based the material on an acrylic monomer with naphthalene as the solvent. The scintillators themselves were printed on anAsiga Pico2UV DLP 3D printer. Once the samples were prepped, they had to be tested for their decay time and efficiency and compared with a commercially available scintillator – BC408.
两个闪烁体在受控的时间内暴露于CAESIUM-137源，导致662KeV的伽马射线。3D打印零件的平均衰减时间为15.6纳秒，这是初始激发和光子发射之间的时间。它们的内在检测效率也为6.81％，这是任何给定的伽马射线都会与材料反应并被检测到的概率。
尽管测得的值听起来很低，但它们俩都与行业标准BC408闪烁体非常紧密。结果导致研究人员得出结论，其配制的树脂和打印参数可以可靠地用于快速定时检测目的和高计数速率的环境中 - 所有这些都包含在具有成本效益且可定制的软件包中。
该研究的更多细节可以在标题为“”的论文中找到Performance of 3D printed plastic scintillators for gamma-ray detection’。它由Dong-Geon Kim，Sangmin Lee，Junesic Park，Jaebum Son，Tae Hoon Kim，Yong Hyun Kim，Kihong Pak和Yong Kyun Kim合着。
The additive manufacturing of sensors and detectors has really started to gain some traction in the academic community. Recently,a team of researchers from theUniversity of WashingtonandSandia National Laboratories3D printed a working carbon monoxide detector. The scientists decorated a reduced graphene oxide (rGO) sensor medium with a printed tin dioxide (SnO2) semiconductor catalyst, producing a detector that functioned at room temperature with a fast response time.
Elsewhere, in China, researchers3D打印了灵活的运动传感器using consumer-grade DLP technology. The wearable sensor was based on a tough and conductive polymer hydrogel with an impressive set of mechanical and electro-conductive properties.
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Featured image shows plastic scintillators glowing when irradiated. Photo via Eljen Technology.
