Measurement of the properties of a flat-panel gas X-ray detector

Yun, Min; Cho, Sung-Ho; Oh, Kyung-Min; Kim, Min-woo; Jung, Suk-Hee; Jang, Gi-won; Heo, Soon Chul; Kwon, Chul Soon; Nam, Sang-Hee

doi:10.1016/j.nima.2009.03.174

Cited by 11 publications

(6 citation statements)

References 2 publications

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“…Based on this result, in this study, 50 V was selected as an optimum voltage, since signal acquisition reached saturation level when higher voltages were applied as shown in figure 9 (b). The voltage which causes the saturation level was 50 V, which is lower than that in previous study [7]. This is due to the modification of top electrode shape, which reinforces the electric field.…”

Section: Readout Circuit Configurationcontrasting

confidence: 67%

“…Like this, in this study, the parylene layer, the structure of top electrode, and the adjustment of electric field, act as the retention and transfer electric signals for a 2D image acquisition. In a previous study, the feasibility of the gas-type X-ray sensor was proved by measuring its high sensitivity to X-ray energy and low charge trapping phenomenon [7]. Also, the kinds of mixture gas and their injection ratio in the gas-type X-ray detector were optimized to efficiently convert X-rays into electrical charges [8].…”

Section: Jinst 7 P07016mentioning

confidence: 99%

“…From the previous study, the gas-type X-ray detector employed a different ratio in order to generate electrons and ions linearly in response to X-ray exposure. Therefore, in this experiment, the gas ratio is 90% of heavy gas, Xe, and 10% of light gas, He [7]. The role of Xe is to convert X-rays into electrons and ions, while the purpose of He is to improve the mobility of generated charges.…”

Section: Sample Fabrication Of the Gas Type X-ray Detectormentioning

confidence: 99%

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Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

Oh¹,

Shin²,

Yun³

et al. 2012

J. Inst.

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We have developed a planar gas-type detector, based on a charge injection device; this device can be used for digital X-ray imaging. Previously, in order to obtain X-ray images, a planar gas-type detector utilized a line-scanning module based on a one-dimensional readout system; however, that technology suffered from a limitation such as a long readout time, not suitable for a fluoroscopy or a moving imaging acquisition. In this study, a readout module based on chargeinjection devices was used in conjunction with the planar gas-type detector to acquire signals and two-dimensional digital images. In the original design, two orthogonally cross-shaped top electrodes, called X address and Y address, played important roles in transferring and collecting the generated charges using electrical potential. During the optimization process, the shape of these top electrodes was modified into a honeycomb shape to increase the efficacy of charge collection. A mixture of gas and dielectric layers were selected to make an efficient gas-type detector for digital X-ray imaging. From the result, the electrical properties of the detector were investigated and the effectiveness of its geometrical design was proved. Measurements demonstrated the linearity of X-ray detection, and the successful movement and collection of charge using electrical potential. Thus, this modified planar gas-type detector and charge readout module using a charge-injection device made it possible to obtain two-dimensional images without using a scanning mode.

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Section: Readout Circuit Configurationcontrasting

confidence: 67%

Section: Jinst 7 P07016mentioning

confidence: 99%

Section: Sample Fabrication Of the Gas Type X-ray Detectormentioning

confidence: 99%

See 1 more Smart Citation

Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

Oh¹,

Shin²,

Yun³

et al. 2012

J. Inst.

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show abstract

“…Recent research found that PDP technology can in principle be used as a radiation detector, by modifying its structure, material and gases etc. The hybrid radiation detector and the plasma panel sensor are two outstanding examples [2][3][4][5]. Similar to the PDP, both the hybrid radiation detector and the plasma panel sensor comprise millions of cells per square meter, each of which can work individually.…”

Section: Introductionmentioning

confidence: 99%

7.3: A Simulation Study of a Flat Panel Detector Based on Shadow Mask PDP

Zhang

Yan

Yang

et al. 2013

Symp Digest of Tech Papers

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A new type of detector, the shadow mask flat panel detector, is proposed and its characteristics are investigated by the program Garfield. The results reveal how the avalanche process and gain of the detector depend on the voltages applied and the structure. It proves that higher positive anode voltage and lower negative shadow mask voltage can enhance the gain. To ease the limitation of the Paschen breakdown, a new design enabling high gain values by suppressing ion feedback is proposed.

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“…However the detectors using this technology have problems, such as fabrication difficulty, high operation voltage, low conversion efficiency, short lifetime and high production cost. Recently a plasma display panel (hereinafter "PDP") has focused as a candidate for flat-panel radiation detector because of low production cost, easy fabrication, large area device and possibility of charge amplification within the cell [3][4] . In this study 2-dimensional plasma simulation code was used to find a new approach of x-ray direct-conversion method with PDP-like geometry and condition.…”

Section: Introductionmentioning

confidence: 99%

X-ray detection method for the direct-conversion plasma detector

et al. 2010

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In this study 2-dimensional plasma simulation code was used to find a new approach of x-ray detection method with PDP-like geometry and condition. A conventional PDP geometry consisted of three electrodes was selected and Ne-Xe composition gas was filled the cell-gap. Depending on incident X-ray energy, the number of charges generated within the cell-gap could be different. For the charge amplification and collection of charges two consecutive ac pulses were applied to scan and address electrodes. The increased charges were collected on the positive-bias address electrode at the rear panel. Two parameters, such as amplitude of collected current and formation delay of collected current, were calculated and compared. The formation delay showed more accurate relationship than the collected current amplitude.

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Measurement of the properties of a flat-panel gas X-ray detector

Cited by 11 publications

References 2 publications

Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

Application of charge-injection devices for digital X-ray imaging using a planar gas-type X-ray detector

7.3: A Simulation Study of a Flat Panel Detector Based on Shadow Mask PDP

X-ray detection method for the direct-conversion plasma detector

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