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STS304L 캡슐의 펄스형 GTA 용접에서 용접변수들이 용접부 형상에 미치는 영향
이형근,한현수,손광재,Lee, Hyoung-Keun,Han, Hyon-Soo,Son, Kwang-Jae 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.5
The aim of this paper is to investigate the effects of welding parameters on the weld shape in seal-welding of STS304L capsule for manufacturing a radioisotope source which is widely used in nondestructive testing of metal structures using gamma ray. Pulsed gas tungsten arc (Pulsed GTA) welding is performed for thin cross sectional area of the capsule. Seven welding parameters including current waveform parameters and arc length etc. are selected as main process parameters using design of experiment. The weld shape such as bead width, penetration depth, weld area, aspect ratio and area rate is investigated to assess the effects of welding parameters. As results, the combination of pulse duty/welding speed largely affects on bead width, penetration depth, area and aspect ratio. Finally, it is concluded that the key parameters are the combination of pulse duty/welding speed, base current and arc length, and their optimal conditions are 50%/1.77mm/s, 6.4A and 1 mm.
MC - 50 싸이클로트론을 이용한 123I 제법 연구
이종두(Jong Doo Lee),서용섭(Yong Sup Suh),양승대(Seung Tae Yang),전권수(Kwon Soo Chun),한현수(Hyon Soo Han) 대한핵의학회 1991 핵의학 분자영상 Vol.25 No.2
N/A 123I, which is applied for the thyroid and other in vivo kinetic study, has a special role in life sciences. The 159 KeV r-ray from 123I is almost ideally appropriate for the current imaging instrurnentation. Its decay mode (electron capture) and short half-life (13.3 hr) reduced the burden of radiation dose to the patients, and its chemical property makes it easy to synthesize the labelling compounds. In this experiment, the production of 123I via the nuclear reaction 124Te(p,2n)123I with 28 MeV protons was sutdied. TeO, is used as a target material, because it has goad physical properties. The target was prepared with TeO, powder and was rnolten into a ellipsoidal cavity (a=14mm, b=10 mm, 270.8 mg/cm thick) of pure platinum. The irradiation was carried out in the external proton beam with incident energies range from 28 MeV to 22 MeV, and current was 30pA. The loss of TeO, target was significantly reduced by using 4-cooling system in irradiation. The dry distillation method was adopted for the separation of 123I from irradiated target, and when it was kept 5 minutes at 780C, its result was quantitative. The loss of the target material (TeO,) was below 0.2% for each production run and 'I from the dry distillation apparatus was captured with 0. 01 N NaOH in NaI form, then the pH of the solution was adjusted to 7.5-9.0 with HC1/NaOH. The Na123I solution was passed through 0.2pm membrane filter, and sterilized under high pressure and temperature for 30 minutes. The prodvction of 'I is acceptable for clinical application based on the quality of USP XXI.
이주찬,서기석,구정회,방경식,한현수,박성원 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.1
특수형 방사성물질 운반캡슐은 국내외의 수송관련 법규에 규정된 기술기준을 만족하도록 설계, 제작되어야 한다. 본 연구의 목적은 하나로에서 생산된 192Ir 특수형 동위원소 운반캡슐의 건전성을 평가하는데 있다. 법규에서 규정된 낙하시험, 타격시험, 굽힘시헝 및 가열시험조건에 대한 안전성 시험을 수행하였으며, 각각의 시험 전후에 누설시험을 수행하였다. 또한, 안전성시험과 더불어 컴퓨터코드를 이용한 전산해석을 수행하여 안전성시험 전에 시험결과에 대한 예측자료로 활용되었다. 낙하시험 및 가열시험 결과 캡슐 표면에서 약간의 흠집과 변형이 발생하였으나, 각각의 시험에서 평가기준이 되는 캡슐의 손상이나 용융 등은 발생하지 않았다. 또한 각 시험 후 수행한 누설시험 결과 누설이 발생하지 않았다. 따라서 특수형 방사성물질 운반캡슐은 법규에서 규정하는 기술기준을 만족하도록 설계, 제작되었음이 입증되었다. All of sealing capsules to transport a special form radioactive material should be designed and fabricated in accordance with the design criteria prescribed in IAEA standards and domestic regulations. The objective of this study is to demonstrate the safety of a shipping capsule for 192Ir special form radioisotope which produceed in the HANARO. The safety tests were carried out for the impact, percussion, bending and heat test conditions. And leakage tests were carried out before and after the each test. Also, the safety analyses were performed using computer codes in order to verify the test results. The capsule showed slight scratches and deformation, and maintained its structural and thermal integrities in all tests without any severe damage or melting. It also met the allowable limits of leakage rate after earth test. Therefore, it has been verified that the capsule was designed and fabricated to meet all requirements for the special form.
崔在時,韓賢洙,金奎弘,崔承洛 연세대학교 자연과학연구소 1978 學術論文集 Vol.2 No.-
CO 및 SO_2의 산화반응을 α-Fe_2O_3를 사용하여 각종 산소압력하에서 200~350℃(CO) 및 220~280℃(SO_2) 흡착기구와 아울러 속도론적 연구를 실시하였다. CO산화반응에서 E_a=10.8kcal/mole및 -dp/dt=k P_co P_o2^0.5이며 SO_2 산화반응에 대하여는 -dp/dt=kP_so_2 P_o_2^0.5 및 E_a=18.8 kcal/mole 임을 확인하였다. CO 산화반응에 대한 mechanism은 흡착 site인 산소공위 V_o-2e´및 철의 interstitial site인 Fe^2+로서 설명하였으며 SO_2반응에 대하여도 vacancy mechanism을 들어 설명하였다. 특히 rate determining step은 전기전도도 측정법으로 극히 성공적인 뒷받침아래 결정하였다. The catalytic oxidation of CO has been investigated in the presence of vacuum activated α-Fe_2O_3 under various partial pressures of CO and O_2 at temperatures from 200 to 350℃. The oxidation rates have been correlated with 1.5 order kinetics; first-order with respect to CO and 0.5 order for O_2. CO appears to be adsorbed essentially in an ionic, while O_2 is adsorbed in an ionic as well as a non-ionic species. Two surface sites, probably Fe_i^2+ interstitial and oxygen vacancy, might be required to adsorb CO and O_2. The conductivity data show that the adsorption of CO exceeds the O_2 adsorption and indicate that the adsorption process of CO (CO(g)→CO^+(ads)+e^-) in the rate determining step. From the agreement between the kinetic data and conductivity measurements, the oxidation mechanism of CO and the defect structure of the vacuum-activated α-Fe_2O_3 are suggested.