• 한국진공학회지
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• 제17권3호
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• pp.247-252
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• 2008

휴대용 XRF(X-Ray Fluorescence) 장치에 적용하기 위하여 개발한 투과 양극형 x-ray tube를 이용하여 XRF 실험을 하고, x-ray tube가 XRF data에 미치는 영향을 조사하였다. W-target tube와 Rh-target tube를 이용하여 측정한 XRF data는 알려진 결과와 잘 일치하였다. 35 kV와 관전압과 $40{\mu}A$의 관전류에서 W-target tube로 측정한 Fe $K_{\alpha}$-line의 FWHM은 약 180 eV로써, 이 값은 물질의 성분분석을 하기에 충분한 것으로 확인하였다. XRF data와 x-ray tube의 적분강도 곡선을 비교 분석해 본 결과, 휴대용 XRF 장치에는 W-Target tube보다는 Rh-Target tube를 사용하는 것이 더 유리함을 밝혀내었다.

• 한국진공학회지
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• 제16권4호
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• pp.305-310
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• 2007

W-target 투과양극형 x-ray tube를 개발하고, 특성을 조사하였다. 관전압이 12kV이하에서는 연속 x-ray만 방출되었고, 12kV 이상에서부터 특성 x-ray가 관측되었다. 연속 x-ray와 특성 x-ray의 에너지 분포 및 선량 특성을 조사한 결과 알려진 결과와 잘 일치함을 알 수 있었다. 또한 상용화된 제품과의 비교에서, 기존 제품 이상의 성능을 가질 수 있음을 확인하였다. 따라서 본 연구에서 개발된 x-ray tube는 상용화할 수 있을 만큼 충분히 우수한 특성을 가지고 있음을 확인하였다.

• 한국진공학회지
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• 제17권3호
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• pp.240-246
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• 2008

수십에서 수백 ${\mu}m$ 영역의 필름 두께 측정에 적용하기 위한 Ag-target 투과양극형 x-ray tube를 개발하고 특성을 조사하였다. 10kV 부근의 관전압에서 x-ray 에너지의 분포 및 선량특성을 조사하고 W-target tube와 비교하여 논의하였다. 또한 Ag-target tube와 W-target tube를 이용하여 Ny film과 PP film의 두께변화에 따른 x-ray의 투과 특성으로 조사하였고, 그 결과 개발된 x-ray tube는 필름두께 측정용으로 적용할 수 있을 만큼 충분히 좋은 특성을 나타내었다.

• Nuclear Engineering and Technology
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• 제48권3호
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• pp.799-804
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• 2016

A miniature X-ray tube based on a carbon-nanotube electron emitter has been employed for the application to a dental radiography. The miniature X-ray tube has an outer diameter of 7 mm and a length of 47 mm. The miniature X-ray tube is operated in a negative high-voltage mode in which the X-ray target is electrically grounded. In addition, X-rays are generated only to the teeth directions using a collimator while X-rays generated to other directions are shielded. Hence, the X-ray tube can be safely inserted into a human mouth. Using the intra-oral X-ray tube, a dental radiography is demonstrated where the positions of an X-ray source and a sensor are reversed compared with a conventional dental radiography system. X-ray images of five neighboring teeth are obtained and, furthermore, both left and right molar images are achieved by a single X-ray shot of the miniature X-ray tube.

• 한국진공학회지
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• 제17권3호
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• pp.234-239
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• 2008

휴대용 XRF (X-Ray Fluorescence) 장치에 적용할 수 있는 40 kV용 투과 양극형 W-Target tube와 Rh-Target tube를 개발하고 특성을 조사하였다. 특성 x-ray의 에너지와 연속 x-ray의 선량특성은 알려진 결과와 잘 일치함을 확인하였고, 최대 선량을 추출하기 위한 양극금속 박막의 최적 두께는 W-target tube의 경우 약 $2.6{\mu}m$, Rh-target tube의 경우 약 $2.7{\mu}m$ 임을 밝혀내었다. 또한 관전압 40 kV, 관전류 $60{\mu}A$로 30분 동안 연속적으로 작동시켰을 때 양극에서의 온도는 $50^{\circ}C$를 넘지 않아 휴대용 XRF장치에 적용할 수 있음을 확인하였다.

• Design & Manufacturing
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• 제15권1호
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• pp.26-31
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• 2021

As the aging ages, the disease also increases, and the development of AI technology and X-ray equipment used to treat patients' diseases is also progressing a lot. X-ray tube converts only 1% of electron energy into X-ray and 99% into thermal energy. Therefore, when the cooling time of the anode and the X-ray tube are frequently used in large hospitals, the amount of X-ray emission increases due to temperature rise, the image quality deteriorates due to the difference in X-ray dose, and the lifespan of the overheated X-ray tube may be shortened. Therefore, in this study, temperature rise and cooling time of 60kW, 75kW, and 90kW of X-ray tube anode input power were studied. In the X-ray Tube One shot 0.1s, the section where the temperature rises fastest is 0.03s from 0s, and it is judged that the temperature has risen by more than 50%. The section in which the temperature drop changes most rapidly at 20 seconds of cooling time for the X-ray tube is 0.1 seconds to 0.2 seconds, and it is judged that a high temperature drop of about 65% or more has occurred. After 20 seconds of cooling time from 0 seconds to 0.1 seconds of the X-ray tube, the temperature is expected to rise by more than 3.7% from the beginning. In particular, since 90kW can be damaged by thermal shock at high temperatures, it is necessary to increase the surface area of the anode or to require an efficient cooling system.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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• pp.403-406
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• 2006

A new medical X-ray PIV technique was developed using a conventional medical X-ray tube. To acquire images of micro-scale particles, the X-ray PIV system consists of an x-ray CCD camera with high spatial resolution, and a X-ray tube with small a focal spot. A new X-ray exposure control device was developed using a rotating disc shutter to make double pulses which are essential for PIV application. Synchronization methodology was also developed to apply the PIV technique to a conventional medical X-ray tube. In order to check the performance and usefulness of the developed X-ray PIV technique, it was applied to a glycerin flow in an opaque silicon tube. Tungsten particles which have high X-ray absorption coefficient were used as tracer particles. Through this preliminary test, the spatial resolution was found to be higher than ultrafast MRI techniques, and the temporal resolution was higher than conventional X-ray PIV techniques. By improving its performance further and developing more suitable tracers, this medical X-ray PIV technique will have strong potential in the fields of medical imaging or nondestructive inspection as well as diagnosis of practical thermo-fluid flows.

• International Journal of Contents
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• 제9권1호
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• pp.38-41
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• 2013

The clamp meter maintains electric safety as a non-invasive method while measuring the absolute value of tube current with it has been recently developed for an X-ray high-tension cable. Especially this can show high accuracy at short X-ray exposure time. Considering such a condition, this study is to evaluate the feasibility of a clamp meter in measuring X-ray tube current by taking the measurements and comparing with those of the Dynalyzer III which has been considered as a standard measuring device. From measuring the tube current accuracy depending on changes in tube voltage and exposure time, the clamp meter showed higher accuracy rate which was -1.3~4.2% difference. Thus clamp meter can be used for clinical radiologists who are not familiar electric circuit to manage X-ray devices easily and correctly in the future.

• 대한방사선기술학회지:방사선기술과학
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• 제16권2호
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• pp.45-50
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• 1993

In this paper, the PAE of tube voltage of 93 diagnostic X-ray units those are using at the 19 general hospitals and 9 local clinics in the area of Sungnam, Inchun, and Seoul have been surveyed. The results are summarized as following. 1. PAE of tube Voltage 70, 100KV at the 56 (60%) X-ray units were ${\pm}7%$ below, at the 8 units (9%), were ${\pm}7%$ above, and those 29 X-ray units (31%) were ${\pm}7%$ below or above with the 70, 100KV tube Voltage in a unit. 2. PAE ${\pm}7%$ below were 68 X-ray units, at the low tube voltage (70KV), and 76 X-ray units at the high tube Voltage (100KV). 3. For six year-use abofe, used X-ray units were PAE ${\pm}7%$ above, and so, the longer used years the more X-ray units became declined in those performance. 4. PAE of tube Voltage were better efficiency at the large capacity 30 X-ray units than small capacity 10. 5. PAE ${\pm}7%$ abovein were only 8 units among 84 diagnostic X-ray units in the general hospitals.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1339-1340
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• 2011