• Title, Summary, Keyword: Plastic scintillator

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Improved 3D Printing Plastic Scintillator Fabrication

  • Son, Jaebum;Kim, Dong Geon;Lee, Sangmin;Park, Junesic;Kim, Yonghyun;Schaarschmidt, Thomas;Kim, Yong Kyun
    • Journal of the Korean Physical Society
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    • v.73 no.7
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    • pp.887-892
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    • 2018
  • 3D printing techniques can be widely used for various applications owing to their fast speed, convenience, and customized shape output. The 3D printing technique is applicable to plastic scintillator fabrication which typically uses polymerization. Currently, research on application of the 3D printing technique based on photopolymerization to plastic scintillator fabrication is being pursued. However, performance of the photopolymerized scintillators reported till now is lower than that of commercial plastic scintillators (~ 30%). We have carried out research on performance improvement of the scintillator fabricated by the photopolymerization, for radiation dose measurement. Photopolymer resin with novel recipe based on acrylic monomer and naphthalene was used to fabricate the scintillator instead of the photopolymer resin based on styrene, which is typically used as the monomer for commercial scintillator. 3D printer with digital light processing was used for the photopolymerization of the photopolymer resin. As a result, light output performance of the fabricated plastic scintillator was about 67% compared with that of the commercial plastic scintillator, BC-408. The performance of the scintillator fabricated by the photopolymerization was thus improved to more than two times that obtained by previous researchers. This is sufficient to be applied to the radiation dose measurement with high dose rates such as radiation therapy. It also demonstrated the applicability of the 3D printing technique in scintillator fabrication.

Optimization of the Wavelength Shifter Ratio in a Polystyrene Based Plastic Scintillator through Energy Spectrum Analysis (에너지스펙트럼 분석을 통한 폴리스타이렌 기반 플라스틱 섬광체의 파장쉬프터 비율 최적화)

  • Kim, Yewon;Moon, Myungkook;Kim, Myung Soo;Yoo, Hyunjun;Lee, Daehee;Cho, Gyuseong
    • Journal of Radiation Industry
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    • v.10 no.4
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    • pp.167-171
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    • 2016
  • The scintillation efficiency of the polystyrene based plastic scintillator depends on the ratio of the wavelength shifters, organic fluors(PPO and POPOP). Thus, 24 samples of the plastic scintillator were fabricated in order to find out the optimum ratio of the wavelength shifters in the plastic scintillator. The fabricated plastic scintillators were trimmed through a cutting and polishing process. They were used in gamma energy spectrum measurement with the $^{137}Cs$ emitting mono-energy photon with 662 keV for the comparison of the scintillation efficiency. As a result, it was found out that the scintillator sample with 1.00 g of PPO (2,5-Diphenyloxazole) and 0.50 g of POPOP (1,4-Bis(5-phnyl-2oxidazolyl)benzene) dissolved in 100 g of styrene solution has the optimum ratio in terms of the light yield of the polystyrene based plastic scintillator.

Proton-Induced Scintillation Properties of a UV-Cured Plastic Scintillator

  • Kim, Sunghwan;Seoung, Youl-Hun
    • Journal of the Korean Physical Society
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    • v.73 no.8
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    • pp.1123-1125
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    • 2018
  • In this study, we fabricated and characterized a UV-curable plastic scintillation resin for 3D printing technology. The resin for 3D printing was prepared by using the co-polymers MMA (methyl meta-acrylate, DHPA (dipentaerythritol hexa-acrylate), naphthalene and PPO (2,5-diphenyloxazole) organic scintillator obtained from Sigma Aldrich. Irgacure 184 (BASF Co.) was used as a photo-initiator. Protons and X-ray-induced luminescence spectra of the UV-cured plastic scintillator were measured. For the emission spectrum, QE65000 and USB4000 optic spectrometers (Ocean Optics) were used. The cured plastic scintillator showed an emission spectrum at wavelength between 380 and 650 nm, peaking at 405 nm and 550 nm, excited by using 100 MeV proton. The observed emission matched well with the quantum efficiency curve of the photodiode. The result showed that the scintillator provided the possibility of adding 3D printing technology, and applications can be found in human dosimetry, etc.

Scintillation Properties of Acrylate Based Plastic Scintillator by Photoploymerization Method (아크릴레이트 기반 광중합 플라스틱 섬광체의 섬광 특성)

  • Kim, Sunghwan;Lee, JoonIl
    • Journal of radiological science and technology
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    • v.39 no.4
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    • pp.637-642
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    • 2016
  • In this study, we prepared and characterized a acrylate based UV-curable plastic scintillator. It was used co-polymers TMPTA, DHPA and Ultima $Gold^{TM}$ LLT organic scintillator. The emission spectrum of the plastic scintillator was located in the range of 380~520 nm, peaking at 423 nm. And the scintillator is more than 50% transparent in the range of 400~800 nm. The emission spectrum is well match to the quantum efficiency of photo-multiplier tube and the fast decay time of the scintillation is 12 ns, approximately. This scintillation material provides the possibility of combining 3D printing technology, and then the applications of the plastic scintillator may be expected in human dosimetry etc.

Development of an Organic Scintillator Sensor for Radiation Dosimetry using Transparent Epoxy Resin and Optical Fiber (투명 에폭시와 광섬유를 이용한 방사선량 측정용 유기섬광체 센서 개발)

  • Park, Chan-Hee;Seo, Bum-Kyoung;Lee, Dong-Gyu;Lee, Kune-Woo
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.7 no.2
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    • pp.87-92
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    • 2009
  • Remote detecting system for a radiation contamination using a plastic scintillator and an optical fiber was developed. Using a commercially available silica optical fiber and a plastic scintillator, we tested then for a real possibility as a remote monitoring detector. Also, a plastic scintillator was developed by itself, and evaluated as a radiation sensor. The plastic scintillator was made of epoxy resin, a hardener and an organic scintillation material. The mixture rate of the epoxy resin, hardener and organic scintillator was fixed by using their emission spectrum, transmittance, intensity etc. In this study, in order to decrease the light loss of an incomplete connection between an optical fiber and a scintillator, the optical fiber was inserted into the scintillator during the fabrication process. The senor used a plastic optical fiber and was estimated for its detection efficiency by an optic fiber's geometric factor.

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Development of ZnS(Ag)/plastic dual scintillator sheet for simultaneous alpha- and beta-ray counting (알파 및 베타선 동시측정용 ZnS(Ag)/플라스틱 이중섬광체 검출센서 개발)

  • Seo, Bum-Kyoung;Woo, Zu-Hee;Kim, Gye-Hong;Lee, Kune-Woo;Lee, Dong-Gyu;jung, Chong-Hun
    • Analytical Science and Technology
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    • v.21 no.2
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    • pp.117-122
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    • 2008
  • Dual scintillator for simultaneous alpha- and beta-ray counting used by detection materials of a surface contamination monitor was developed. In this study, preparation method was not a heat melting method but a solvent method, by which the counting material was manufactured by dissolving the polymer materials with solvent. It was simplified the preparation process. Plastic scintillator for beta-ray counting was prepared by solidifying the casting solution mixed with organic scintillator, polymer, and solvent. ZnS(Ag) scintillator layer was prepared by screen printing the paste solution mixed with ZnS(Ag), paste, and solvent onto the plastic layer. The good counting ability for alpha- and beta-ray using the ZnS(Ag)/plastic dual scintillator prepared and possibility for the counting material of surface contamination monitor was confirmed.

Measurement of Depth Dose Distribution Using Plastic Scintillator

  • Hashimoto, Masatoshi;Kodama, Kiyoyuki;Hanada, Takashi;Ide, Tatsuya;Tsukahara, Tomoko;Maruyama, Koichi
    • Proceedings of the Korean Society of Medical Physics Conference
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    • pp.244-247
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    • 2002
  • We examined a possibility to use inorganic plastic scintillator, which has the effective atomic number close to that of human soft tissue, for the measurement of dose distributions in a shorter time period. The method was to irradiate a block of plastic scintillator as a phantom, and to measure the distribution of the scintillation light by a wave length analyzer through a thread of plastic optical fiber. By irradiating the diagnostic x-ray, we observed the emission spectrum of the scintillation light from the scintillator. It showed a peak at around 420nm with a full width of 140 nm. The emission spectrum was integrated to determine the total number of photons. The dependences of the amount of photons on the irradiated dose were measured. The results of the experiment show that the amount of emission light is in proportional to the irradiated dose. From this fact, we conclude that the present method can be used for the measurement of the depth dose distribution of the diagnostic x-rays.

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Performance Evaluation of a Plastic Scintillator for Making a In-situ Beta Detector (현장 적용형 베타검출기 제작을 위한 플라스틱 섬광체의 성능 평가)

  • Nam, Jong Soo;Kim, Yong Uhn;Hong, Sang Bum;Seo, Bum Kyung;Kim, Ki Hwan
    • New Physics: Sae Mulli
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    • v.67 no.9
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    • pp.1080-1085
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    • 2017
  • In this study, a plastic scintillator was fabricated to design a radiation detector for in-situ measurement of radioactivity at a site contaminated with radionuclides emitting beta-rays, such as $^{90}Sr$ or $^{238}U$, in a nuclear power plant at the end of its life cycle or a nuclear accident such as that at Fukushima. The performance of the fabricated plastic scintillators was evaluated. The plastic scintillator PS-0201 fabricated by mixing 0.2 wt% of PPO and 0.01 wt% of POPOP in epoxy was found to have good beta-ray absorption, as well as light emission and transmittance, characteristics comparable to thoose of commercial plastic scintillator BC-40004. Scanning electron microscope images confirmed that the homogeneity of the surface and the cutting plane of the plastic scintillator PS-0201 fabricated in this study was superior to that of BC-40004.

Fundamental approach to development of plastic scintillator system for in situ groundwater beta monitoring

  • Lee, UkJae;Choi, Woo Nyun;Bae, Jun Woo;Kim, Hee Reyoung
    • Nuclear Engineering and Technology
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    • v.51 no.7
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    • pp.1828-1834
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    • 2019
  • The performance of a plastic scintillator for use in an in situ measurement system was analyzed using simulation and experimental methods. The experimental results of four major pure beta-emitting radionuclides, namely $^3H$, $^{14}C$, $^{32}P$, and $^{90}Sr/^{90}Y$, were compared with those obtained using a Monte Carlo N-particle (MCNP) code simulation. The MCNP simulation and experimental results demonstrated good agreement for $^{32}P$ and $^{90}Sr/^{90}Y$, with a relative difference of 1.95% and 0.43% between experimental and simulation efficiencies for $^{32}P$ and $^{90}Sr/^{90}Y$, respectively. However, owing to the short range of beta particles in water, the efficiency for $^{14}C$ was extremely low, and $^3H$ could not be detected. To directly measure the low-energy beta radionuclides considering their short range, a system where the source could flow directly to the scintillator was developed. The optimal thickness of the plastic scintillator was determined based on the suggested diameter. Results showed that the detection efficiency decreases with an increase in the depth of the water. The detection efficiency decreased drastically to approximately 10 cm, and the tendency was gradually constant.