• 대한핵의학회:학술대회논문집
• /
• 대한핵의학회 1999년도 제38차 춘계학술대회
• /
• pp.189-192
• /
• 1999

$^{188}Re$ (${\beta}^-=2.2$ MeV; ${\gamma}^-$=155 keV; $T_{1/2}$=16.9 hours) is an attractive therapeutic radioisotope which is produced from decay of reactor-produced tungsten-188 parent ($T_{1/2}$=69 days). $^{188}W$ has been produced from the double neutron capture reaction of $^{186}W.\;^{188}Re$ can be easily obtained by elution of saline on alumina based $^{188}W/^{188}Re$ generator, which is commercially available. Complexes labelled with $^{188}Re$ have been developed for the radiotherapy treatment of diseases because of the desirable nuclear properties of the radioisotope and it's chemical properties similar to those of technetium, a well established diagnostic agent.

• Nuclear Medicine and Molecular Imaging
• /
• 제43권2호
• /
• pp.154-155
• /
• 2009

A 45-year-old man presented with fatigue and weight loss underwent a Tc-99m MDP bone scan because of increased serum alkaline phosphatase. Delayed images at 4 hours demonstrated diffuse increased activity throughout both lobes of the thyroid in the absence of activity of the stomach and salivary glands. Thyroid laboratory indices and a Tc-99m pertechnetate thyroid scan suggested Graves' hyperthyroidism.

• Nuclear Engineering and Technology
• /
• 제21권3호
• /
• pp.216-222
• /
• 1989

원자력병원에 설치되어 있는 MC-50 싸이클로트론은 중성자 치료와 의학용 동위원소 생산을 위해 가동중에 있다. 본 논문에서는 MC-50의 설계 특징, 기계적 구조, 가동 특성에 대하여 기술하고 있다. 본 싸이클로트론의 최적 가동 조건은 반복적인 운전에 의해 결정되었으며, 내부 빔의 성능은 싸이클로트론 반경의 함수로서 내부 빔의 세기 및 공간 분포 측정을 통해 조사되어졌다. 일상적으로, 인출효율이 61%일 때 40$\mu$A세기의 50 MeV 양성자 빔을 얻었다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 B
• /
• pp.442-444
• /
• 1998

We made the beam crosssectional monitor system which was possible to display the ion beam crosssection extracted from accelerator on personal computer monitor. Previous beam profile monitor system could detect the central beam position with limited low beam current, but this developed beam crosssectional monitor system could operate at the relatively higher beam current. In addition we realized the real time data taking system by adopting the VXI system for beam size, central position and crosssection.

• 천문학회보
• /
• 제37권2호
• /
• pp.119.2-119.2
• /
• 2012

Charged particle energization is an outstanding problem in space physics. This paper investigates the nonlinear dynamics of Alfve'n-cyclotron waves accompanying particle heating processes and the drift Alfv'en-cyclotron (or EMIC) instability associated with a current disruption event on 29 January 2008 observed with THEMIS satellite by means of a particle-in-cell simulation. The simulation shows that the drift Alfv'en-cyclotron instabilities are excited in two regimes, a relatively low frequency mode propagating in a quasi-perpendicular direction while the second high-frequency branch propagating in a predominantly parallel propagation direction, which is consistent with observation as well as earlier theories. It is shown that parametric decay processes lead to an inverse cascade of Alfv'en-cyclotron waves and the generation of ion-acoustic waves by decay instability. It is also shown that the nonlinear decay processes are accompanied by small perpendicular heating and parallel cooling of the protons, and a pronounced parallel heating of the electrons.

• 한국자기공명학회논문지
• /
• 제24권1호
• /
• pp.16-22
• /
• 2020

Based on quantum transport theory, we investigated theoretically the magnetic field dependence of the quantum optical transition of quasi 2-dimensional Landau splitting system, in CdS and ZnO Through the analysis of the current work, we found the increasing properties of the cyclotron resonance line-profiles (CRLPs) which show the absorption power and the cyclotron resonance line-widths (CRLWs) with the magnetic field in CdS and ZnO We also found that that CRLWs, γ_total(B) of CdS < γ_total(B) of ZnO in the magnetic field region B < 15 Tesla.

• Nuclear Engineering and Technology
• /
• 제50권7호
• /
• pp.1106-1111
• /
• 2018

Electromagnetic waves potentially have been used to heat overdense nuclear fusion plasmas through a double mode conversion from ordinary to slow extraordinary and finally to Electron Bernstein Wave (EBW) modes, OSXB. This scheme is efficient and has not any plasma density limit of electron cyclotron resonance heating due to cut-off layer. The efficiency of conversion depends on the isotropic launching angles of the microwaves with the plasma parameters. In this article, a two-step mode conversions of OSXB power transmission efficiency affected by the fast extraordinary (FX) loses at upper hybrid frequency are studied. In addition, the kinetic (hot) dispersion relation of a overdense plasma in a full wave analysis of a OSXB in Wendelstein 7X (W7-X) stellarator plasma has been numerically simulated. The influence of plasma dependent parameters such as finite Larmor radius, electron thermal velocity and electron cyclotron frequency are represented.

• Nuclear Engineering and Technology
• /
• 제55권8호
• /
• pp.3114-3120
• /
• 2023

A high-accuracy magnetic field measurement device based on a cyclotron is being developed for accelerator mass spectrometry (AMS). In this study, a magnetic field measurement device consisting of a Hall probe sensor, piezo-motor, and step motor was developed to measure the magnetic field of the AMS cyclotron magnet. The Hall probe sensor was calibrated to achieve positional accuracy by using polar coordinates. The measurement results between the ratchet gear and piezo-motor, which are the instruments used for driving the measurement device, were analyzed. The measurement result of the device with a piezo-motor exhibits a difference of 5 Gauss (0.04%) as compared with the simulation result.

• 한국원자력학회:학술대회논문집
• /
• 한국원자력학회 2004년도 추계학술발표회 발표논문집
• /
• pp.676-677
• /
• 2004

• 한국방사선학회논문지
• /
• 제10권7호
• /
• pp.489-494
• /
• 2016

사이클로트론에서 발생되는 핵반응은 불필요한 중성자를 발생시키며, 이로 인해 주변 물질들이 방사화되게 된다. 방사화된 물질은 방사선피폭의 원인으로, 공기가 방사화 되었을 경우 인체에 흡입되어 내부피폭을 발생 시킨다. 이에 본 연구에서는 16.5 MeV의 초소형 사이클로트론의 운영에 따른 내부 공기의 방사화를 분석하고자 하였다. 실험결과 초소형 사이클로트론의 핵반응으로 발생되는 방사화는 종사자에게 매우 낮은 내부피폭을 발생시키는 것을 확인할 수 있었으며, 방사화로 인하여 발생된 방사능을 법적 기준치와 비교하여 보았을 때 기준치 이하로 법적 관리의 대상에서 제외 될 수 있음을 알 수 있었다. 하지만, 사이클로트론의 에너지가 높아짐에 따라 내부피폭의 위험성은 더욱 높아질 우려가 있으며, 이에 따라 국내에 정립 되어 있지 않는 방사선 관련 시설의 환기설비에 대한 기준이 필요할 것으로 사료되었다.