• Title/Summary/Keyword: Proton Accelerator

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Analysis of Proton Nuclear Reaction-Generated Nuclides for Different Proton Energy (양성자 에너지 변화에 따른 핵반응 생성핵종 분석)

  • Lee, Samyol
    • Journal of the Korean Society of Radiology
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    • v.13 no.5
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    • pp.819-824
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    • 2019
  • In this study, we proposed a method for identifying isotopes generated from high-energy proton $^{nat}Pb$(p,xn) nuclear reactions through the difference of gamma rays generated through nuclear reactions using different proton energies. The experiment was performed by using a high energy proton generated from a 100 MeV proton linear accelerator of the Korea Atomic Energy Research Institute. Gamma rays generated by various nuclides generated through proton nuclear reactions were measured using a gamma-ray spectroscopy system composed of HPGe detectors. Gamma-ray standard sources were used for accurate energy calibration and efficiency measurements of HPGe gamma-ray detectors. For the proposed method, 100 and 60 MeV proton energy beams were used for the same natural lead samples. This method was found to be very effective in identifying nuclides produced by comparing gamma rays generated from the same sample with each other. The results of this study are expected to be very effective in obtaining other proton nuclear reaction results in the future.

Benchmarks of subcriticality in accelerator-driven system at Kyoto University Critical Assembly

  • Pyeon, Cheol Ho;Yamanaka, Masao;Kim, Song-Hyun;Vu, Thanh-Mai;Endo, Tomohiro;Van Rooijen, Willem Fredrik G.;Chiba, Go
    • Nuclear Engineering and Technology
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    • v.49 no.6
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    • pp.1234-1239
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    • 2017
  • Basic research on the accelerator-driven system is conducted by combining $^{235}U$-fueled and $^{232}Th$-loaded cores in the Kyoto University Critical Assembly with the pulsed neutron generator (14 MeV neutrons) and the proton beam accelerator (100 MeV protons with a heavy metal target). The results of experimental subcriticality are presented with a wide range of subcriticality level between near critical and 10,000 pcm, as obtained by the pulsed neutron source method, the Feynman-${\alpha}$ method, and the neutron source multiplication method.

Fabrication of a fast Switching Thyristor by Proton Irradiation Method (양성자 조사법에 의한 고속스위칭 사이리스터의 제조)

  • Kim, Eun-Dong;Zhang, Changli;Kim, Sang-Cheol;Kim, Nam-Kyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.12
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    • pp.1264-1270
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    • 2004
  • A fast switching thyristor with a superior trade-off property between the on-state voltage drop and the turn-off time could be fabricated by the proton irradiation method. After making symmetric thyristor dies with a voltage rating of 1,600 V from 350 $\mu$m thickness of 60 $\Omega$ㆍcm NTD-Si wafer and 200 $\mu$m width of n-base drift layer, the local carrier lifetime control by the proton irradiation was performed with help of the HI-13 tandem accelerator in China. The thyristor samples irradiated with 4.7 MeV proton beam showed a superior trade-off relationship of $V_{TM}$ = 1.55 V and $t_{q}$ = 15 $\mu$s attributed to a very narrow layer of short carrier lifetime(~1 $\mu$s) in the middle of its n-base drift region. To explain the small increase of $V_{TM}$ , we will introduce the effect of carrier compensation at the low carrier lifetime region by the diffusion current.ffusion current.t.

Proton induced Effects on Commercial Single-mode Optical Fibers (상용 단일모드 광섬유의 양성자 영향)

  • Kim, Jong-yeol;Kim, Young-woong;Ryu, Guk-been;Hwang, Young-gwan;Lee, Min-Woong;Song, Keun-young
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2022.10a
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    • pp.623-625
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    • 2022
  • In this paper, the proton induced attenuation characteristics were evaluated for 5 types of commercial single-mode optical fibers using a proton accelerator. The proton beam used in the irradiation test has a high energy of 100 MeV class, and the test was performed by setting the uniformity of the beam irradiation area to 10% or less. According to the type of optical fiber (internal material, impurities), the radiation induced attenuation by the proton irradiation showed a noticeable difference.

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Room-Temperature Luminescence from Ion Beam or Atmospheric Pressure Plasma-Treated SrTiO3

  • Song, J.H.;Choi, J.M.;Cho, M.H.;Choi, E.J.;Kim, J.;Song, J.H.
    • Applied Science and Convergence Technology
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    • v.23 no.5
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    • pp.261-264
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    • 2014
  • $SrTiO_3$ (STO) single crystal irradiated with a 3-MeV proton beam exhibits blue and green mixed luminescence. However, the same proton beam when used to irradiate STO with a very thin layer of deposited Pt does not show any luminescence. This Pt layer prevents any damage which may otherwise be caused by arcing, which stems from the accumulated surface voltage of tens of kV due to the charge induced by secondary electrons on the surface of the insulator during the ion beam irradiation process. Hence, the luminescence of ion-irradiated STO originates from the modification of the STO surface layer caused by arcing rather than from any direct ion beam irradiation effect. STO treated with atmospheric-pressure plasma, a simple and cost-effective method, also exhibits the same type of blue and green mixed luminescence as STO treated with an ion beam, as the plasma also creates a layer of surface damage due to arcing.

Development of an exclusive column method for 82Sr/82Rb generator using a 100 MeV proton linear accelerator of KOMAC

  • Kye-Ryung Kim;Yeong Su Ha;Sang-Pil Yoon;Yeon-ji Lee;Yong-Sub Cho;Hyeongi Kim;Sang-Jin Han;Jung Young Kim;Kyo Chul Lee;Jin Su Kim
    • Journal of Radiopharmaceuticals and Molecular Probes
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    • v.7 no.2
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    • pp.119-125
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    • 2021
  • 82Sr for 82Rb generator was produced through the irradiation of the proton beam on the nat.RbCI target at the target irradiation facility installed at the end of the Rl-dedicated beamline of the 100 MeV proton linear accelerator of KOMAC (Korea Multi-purpose Accelerator Complex). The average current of the proton beam was 1.2 µA for irradiation time of 150 min. For the separation and purification of the 82Sr from nat.RbCI irradiated, Chelex-100 resin was used. The activities of 82Sr in the irradiated nat.RbCI target solution and after purification were 45.29 µCi and 43.4 µCi, respectively. The separation and purification yield was 95.8%. As an adsorbent to be filled in the generator for 82Sr adsorption hydrous tin oxide was selected. The adsorption yield of 82Sr into the generator adsorbent was > 99 %, and the total amount of 82Sr adsorbed to the generator was 21.6 µCi as of the day of the 82Rb elution experiment. When the elution amount was 22 mL, the maximum82Rb elution yield was 93.3%, and the elution yield increased as the flow rate increased. After the eluted 82Rb was filled in the correction phantom of the small PET for animals, a PET image was taken. The image scan time was set to 5 min, and the phantom PET image was successfully obtained. As results of impurity analysis on eluted 82Rb using ICP-MS, nat.Rb stable isotopes that compete in vivo of 82Rb were identified as undetected levels and were determined to be No-Carrier-Added (NCA).

A Study of Static Random Access Memory Single Event Effect (SRAM SEE) Test using 100 MeV Proton Accelerator (100 MeV 양성자가속기를 활용한 SRAM SEE(Static Random Access Memory Single Event Effect) 시험 연구)

  • Wooje Han;Eunhye Choi;Kyunghee Kim;Seong-Keun Jeong
    • Journal of Space Technology and Applications
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    • v.3 no.4
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    • pp.333-341
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    • 2023
  • This study aims to develop technology for testing and verifying the space radiation environment of miniature space components using the facilities of the domestic 100 MeV proton accelerator and the Space Component Test Facility at the Space Testing Center. As advancements in space development progress, high-performance satellites increasingly rely on densely integrated circuits, particularly in core components components like memory. The application of semiconductor components in essential devices such as solar panels, optical sensors, and opto-electronics is also on the rise. To apply these technologies in space, it is imperative to undergo space environment testing, with the most critical aspect being the evaluation and testing of space components in high-energy radiation environments. Therefore, the Space Testing Center at the Korea testing laboratory has developed a radiation testing device for memory components and conducted radiation impact assessment tests using it. The investigation was carried out using 100 MeV protons at a low flux level achievable at the Gyeongju Proton Accelerator. Through these tests, single event upsets observed in memory semiconductor components were confirmed.

Measurement of Gamma ray Spectrum for the 27Al(p,3p+n)24Na Nuclear Reaction by using 100 MeV Proton Acceleration System (100 MeV 양성자가속기를 이용한 27Al(p,3p+n)24Na 핵반응에 대한 감마선 스펙트럼 측정)

  • Lee, Samyol
    • Journal of the Korean Society of Radiology
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    • v.9 no.1
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    • pp.55-59
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    • 2015
  • Research about the proton nuclear reaction is actively achieving on the proton therapy including material development of fusion reactor. The proton induced gamma ray energy(2754, 1386 keV) spectrum of 27Al(p,3p+n)24Na reaction was measured with 100 MeV high energy proton beam. The proton beam in the experiment was derived from 100 MeV proton linear accelerator in the KOMAC. We measured the gamma ray intensity ratio of the decay level from the energy spectrum. The previous results have been compared with the current result. Strength of measured gamma rays will provide very important information though decide high energy gamma radiation detection efficiency.

Activation Reduction Method for a Concrete Wall in a Cyclotron Vault

  • Kumagai, Masaaki;Sodeyama, Kohsuke;Sakamoto, Yukio;Toyoda, Akihiro;Matsumura, Hiroshi;Ebara, Takayoshi;Yamashita, Taichi;Masumoto, Kazuyoshi
    • Journal of Radiation Protection and Research
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    • v.42 no.3
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    • pp.141-145
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    • 2017
  • Background: The concrete walls inside the vaults of cyclotron facilities are activated by neutrons emitted by the targets during radioisotope production. Reducing the amount of radioactive waste created in such facilities is very important in case they are decommissioned. Thus, we proposed a strategy of reducing the neutron activation of the concrete walls in cyclotrons during operation. Materials and Methods: A polyethylene plate and B-doped Al sheet (30 wt% of B and 2.5 mm in thickness) were placed in front of the wall in the cyclotron room of a radioisotope production facility for pharmaceutical use. The target was Xe gas, and a Cu block was utilized for proton dumping. The irradiation time, proton energy, and beam current were 8 hours, 30 MeV, and $125{\mu}A$, respectively. To determine a suitable thickness for the polyethylene plate set in front of the B-doped Al sheet, the neutron-reducing effects achieved by inserting such sheets at several depths within polyethylene plate stacks were evaluated. The neutron fluence was monitored using an activation detector and 20-g on de Au foil samples with and without 0.5-mm-thick Cd foil. Each Au foil sample was pasted onto the center of a polyethylene plate and B-doped Al sheet, and the absolute activity of one Au foil sample was measured as a standard using a Ge detector. The resulting relative activities were obtained by calculating the ratio of the photostimulated luminescence of each foil sample to that of the standard Au foil. Results and Discussion: When the combination of a 4-cm-thick polyethylene plate and B-doped Al sheet was employed, the thermal neutron rate was reduced by 78%. Conclusion: The combination of a 4-cm-thick polyethylene plate and B-doped Al sheet effectively reduced the neutron activation of the investigated concrete wall.