• Nuclear Engineering and Technology
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• 제53권12호
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• pp.3979-3989
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• 2021

Several parametric effects on the magnetic collection have been evaluated considering dimension, strength of external magnetic field, injected velocity and particle concentration in the working fluid. Besides, accidental environments, expected in the containment of nuclear power plants, have also been addressed for the capture efficiency. The capture efficiency is especially enhanced with magnetic particle size and magnetic field strength through increased magnetic force; the non-magnetic coating thickness and fluid velocity hinder the magnetic collection. Based on the assessment, the magnetic withdrawal system can effectively capture magnetic particles even under accidental environments. Withdrawal of multifunctional magnetic particles or filtering of magnetic impurities can be effectively realized through the system.

• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2005년도 국제학술대회
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• pp.105-139
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• 2005

Increased signal in T1-weighted images was observed in the experimental manganese (Mn) poisoning of the non-human primate and a patient with Mn neurointoxication. However, our study showed that the increased signals in magnetic resonance images (MRI) were highly prevalent (41.6%) in Mn-exposed workers. Blood Mn concentration correlated with pallidal index. These changes in MRI tend to disappear following the withdrawal from the source of Mn accumulation, despite permanent neurological damage. Thus increased signal intensities on a T1-weighted image reflect exposure to Mn, but not necessarily manganism. Our study also showed that the concentration of Mn required to produce increased signal intensities on MRI is much lower than the threshold necessary to result in overt clinical signs of manganism. Increased signal intensities in the globus pallidus were determined by manganese accumulation in the animal experiment. Reanalysis of the previous data with the structural equation model revealed that pallidal index (Pl) on MRI reflects target organ dose of occupational Mn exposure

• 한국임상수의학회지
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• 제32권5호
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• pp.464-468
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• 2015

6살의 중성화한 수컷 말티즈는 운동실조로 인하여 내원하였다. 본 증례는 일반방사선 촬영, 컴퓨터단층촬영, 자기공명영상을 실시하여 낭종의 위치, 크기, 척수와의 관련성 및 동반된 질환을 알 수 있었다. 자기공명영상 결과 T1W과 FLAIR 영상에서는 hypointense한 영역, T2W 영상에서는 hyperintense한 영역이 L1~2 척수의 등쪽으로 나타났다. 이는 CSF와 동일한 신호로 나타났으며, 등쪽에서 척수를 압박하여 배쪽으로 이동시켰다. 낭종의 길이는 25 mm, 두께는 4 mm로 나타났다. 무증상일 경우는 치료가 필요 없으나, 본 증례는 신경학적 이상이 나타나 수술적 치료를 실시하였다.