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121.
Yong-Jae Kim Chang-Kyu Kim Cheol-Su Kim Ju-Yong Yun Byung-Hwan Rho 《Journal of Radioanalytical and Nuclear Chemistry》1999,240(2):613-618
A time-saving and accurate technique for determining226Ra in groundwater and soil was examined, using high-resolution inductively coupled plasma-mass spectrometry (HR-ICP-MS). The
technique was applied to the determination of226Ra in groundwater and soil samples and compared with the conventional liquid scintillation counting method. This technique
was capable of completing226Ra counting within 3 minutes, without the in-growth period to allow radon and its progeny to achieve secular equilibrium with
the parent226Ra. The detection limits of HR-ICP-MS for226Ra in groundwater and soil were 0.19 mBq·1−1 and 0.75 Bq·kg−1, respectively, which were about 10 times lower than that of the liquid scintillation counter. The results obtained from HR-ICP-MS
in groundwater and soil were in accordance with those of LSC within a relative error of about 13%. 相似文献
122.
Seong-Won Moon Joohoon Kim Chanwoong Park Wonjoong Kim Younghwan Yang Jaekyung Kim Seokho Lee Minseok Choi Hansang Sung Jaein Park Hyoin Song Heon Lee Junsuk Rho 《Laser \u0026amp; Photonics Reviews》2024,18(4):2300929
Metalenses have revolutionized optical technologies with their superior ability to manipulate light and the potential to replace conventional, bulky optical components. However, their commercialization is hindered by limitations in conventional manufacturing techniques, such as small patterning areas, low throughput, and high cost. In this study, two methods are introduced for scalable and wafer-scale manufacturing of metalenses operating in the near-infrared region, aimed at overcoming the abovementioned challenges. The first type of metalens is polarization-independent and constructed using hydrogenated amorphous silicon cylindrical structures fabricated through direct photolithography. This metalens has a diameter of 1 cm and numerical aperture (NA) of 0.53. The focusing efficiency is confirmed at a 940 nm wavelength, and the focal spot profile approaches the diffraction limit. The second metalens is polarization-dependent and fabricated using silicon nanoparticle-embedded-resin rectangular structures through a cost-effective nanoimprinting method. This process can produce metalenses with a diameter of 5 mm and an NA of 0.53. Both types of metalenses demonstrate high-resolution capabilities when imaging a 1951 USAF resolution test target and bioimaging. This research offers innovative pathways for the mass production and large-scale fabrication of metalenses. It is believed that the work will accelerate the industrialization of metalenses, fostering further advances in optical technology. 相似文献
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