Conveners
Poster MiniTalks I
- Cinzia Da Via (The University of Manchester)
Dr
Zaťko Bohumír
(Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava)
7/4/11, 12:31 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
Gallium arsenide (GaAs) is III-V semiconductor compound with promising physical properties (wide bang gap, fast reaction rate and good radiation hardness) for fabrication of detectors for various type of ionizing radiation. In this work we focused on detection of fast neutrons. As GaAs does not directly interacts with fast neutrons, the conversion layer has to be applied. Its task lies on the...
Dr
Frank Sukowski
(Fraunhofer Development Center X-Ray Technology (EZRT))
7/4/11, 12:32 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
State of the art X-ray imaging sensors comprise a trade-off between the achievable efficiency and the spatial resolution. For instance a scintillator with a high thickness (i. e. high absorption length), yields a high efficiency but suffers from a decrease in spatial resolution due to (optical) light spreading in the scintillation layer. For thinner scintillators the opposing case is observed....
Mr
Hyoungtaek Kim
(Korea Advanced Institute of Science and Technology)
7/4/11, 12:33 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
The SiPM(silicon photomultiplier) consists of several thousand of micro cells which are operated in geiger mode. In this Geiger mode, only one micro cell is fired when several photons are incident on the same micro cell at the same time. Therefore the dynamic range of the SiPM is determined by the total number of micro cells. The output pulse is shown a linear response when small amount of...
Mr
Hyun Tae Leem
(CMOS APD)
7/4/11, 12:34 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
Because of enhancive integration and advantageous characteristic of high speed and low power dissipation, research on CMOS Geiger mode APD is actively conducted. However, APD fabricated through CMOS process demands higher efficiency of fill factor and modification of interfering noise.
Therefore, the study is conducted to derive optimum size of CMOS APD by comparison and analysis of...
Mr
Tomas Ceponis
(Vinius University, Institute of Applied Research)
7/4/11, 12:35 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
The high resistivity particle Si pin-detectors, operating at full depletion regime, are commonly employed for detection of the ionizing radiation. Radiation induced defects acting as carrier trapping, generation and compensation centers affect the operational parameters of diodes by the increase of leakage current, by reduction of charge collection efficiency and signal to noise ratio....
Mr
Tomas Ceponis
(Vinius University, Institute of Applied Research)
7/4/11, 12:36 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
Ion implantation technology is commonly employed for modification of material properties, device structures, as well as for introducing fast recombination centers in microelectronic, nanoelectronic and optoelectronic devices. Despite beneficial recombination centers, detrimental defects that affect the device operation are introduced during implantation as well. Therefore, it is essential to...
Mr
Erik Fröjdh
(Mid Sweden University)
7/4/11, 12:37 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
High stopping power is one of the most important figures of merit for X-ray detectors. CdTe is a promising material but suffers from: material defects, non-ideal charge transport and long range X-ray
fluorescence. Those factors reduce the image quality and deteriorate spectral information.
In this project we used a monochromatic pencil beam collimated through a 20 um pinhole to measure the...
Mr
kang sang sik
(radiological science of korea international university)
7/4/11, 12:38 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
The ultimate object of this paper is to develop direct conversion radiation detector based on Cd(Zn)Te. A polycrystalline Cd(Zn)Te film was deposited using vacuum thermal evaporation technique as fundamental study of large area film fabrication and then investigated the effect on radiation detection characteristics through physical and electrical measurement. First, the composition and...
Mr
Marcello Borri
7/4/11, 12:39 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
An upgrade of LHC towards a 10 times higher luminosity will require tracking pixel detectors with unprecedented radiation tolerance. Furthermore the high track density will call for fast and high granularity pixel detectors with low radiation length and power consumption. Different types of solid-state sensors are being studied for ATLAS upgrade of tracking system within ATLAS Insertable...
Mr
Nicholas Stoffle
(University of Houston)
7/4/11, 12:40 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
The TimePix readout chip is a hybrid pixel detector with over 65k independent pixel elements. Each pixel contains its own circuitry for charge collection, counting logic, and readout. When coupled with a Silicon detector layer, the Timepix chip is capable of measuring the charge, and thus energy, deposited in the Silicon. Measurements using a NIST traceable 137Cs gamma source have been made...
Mr
Yashar Hormozan
(Material Physics, KTH)
7/4/11, 12:41 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
Structured scintillators coupled with CCDs are promising devices for digital X-ray imaging. These novel X-ray detectors are made by fabrication of high aspect ratio silicon pores by ICP etching, oxidation of the pore walls and finally melting of thallium doped CsI into the pores. In this type of detectors the oxide layer on the pore walls is utilized as the cladding layer similar to optical...
Mr
David Krapohl
(Department of Information Technology and Media, Mid Sweden University)
7/4/11, 12:42 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
Neutron radiation cannot be directly detected in semiconductor detectors and therefore need converter layers. Standard clean-room processes can be used in the manufacturing process of semiconductor detectors with metal layers to produce a cost-effective device. We used the Geant4 Monte-Carlo toolkit to simulate the performance of a semiconductor neutron detector. A silicon photo-diode was...
Mr
Jae Hyung Cho
(Radiography)
7/4/11, 12:43 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
For the detection of FNGR(Fast Neutron and Gamma Radiography), usually a plastic scintillator coupled photo-sensor and a CsI crystal scintillator coupled photo-sensor are used respectively for fast neutrons(14 MeV) and gamma-rays(1.17 & 1.33 MeV of Co-60). Owing to the high energy of radiations, the thickness of the scintillator cannot be sufficiently thickened, and the energy cannot be...
Mr
Han Gyul Song
(Radiography)
7/4/11, 12:44 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
A dual X-ray imaging system uses two different energy spectrums that have different penetrative power that are low and high at the same time. It is advantageous in that it reduces the hardening effect of X-ray and creates a clearer image. In this study, it is predicted that electric signal would not be sufficient for the gain caused by the low intensity of the X-ray beam which is decoupled by...
Mr
Vit Sopko
(IEAP CTU in Prague)
7/4/11, 12:45 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
This paper presents a measurement of defects in the silicon detector; which is made of high resistivity N type material. The Si detector was exposed in a nuclear reactor to neutron flux and as identification method for created defects in Si detector was applied thermally stimulated current (TSC) measurement. In our case we use a modified method of TSC for a diode with zero bias voltage in the...
Dr
Aleksandr Micko
(Riga Technical university, Latvia)
7/4/11, 12:46 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
It was noted that radiation damage occurs in semiconductor radiation detectors during their operation, while measuring ionizing radiation, which impairs the ability of the device [1]. The main expressions of radiation damage are: the increase of leakage current in a semiconductor detector, the need to increase the bias voltage, reduction of the efficiency of collecting the charge created by...
Mr
Tomas Slavicek
(IEAP CTU in Prague)
7/4/11, 12:47 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
Neutron radiation as a non-ionizing radiation is particularly difficult to detect; therefore conversion material are needed. Conversion materials convert neutrons into secondary charged particles to be detected in silicon sensors. The use of titanium diboride (TiB2) as a conversion material deposited by electron beam-physical vapour deposition (EB-PVD) as a part of front side contact of planar...
Mr
Sung Hun Kim
(Biomedical Engineering,Inje University,Obang-dong,Gimhae,Gyeongnam,Republic of Korea)
7/4/11, 12:48 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
In recent times, the study of digital X-ray detector in medical diagnostic has been focused on high resolution image acquisition. The manufacturing methods of digital X-ray detectors can be divided into direct and indirect methods. The indirect system has a low resolution due to blurring of light from scintillator. In contrast, the direct method has higher resolution comparing with indirect...
Ji-na Kim
(Department of Medical Image Science, Inje University, Gimhae 621-749, Republic of Korea)
7/4/11, 12:49 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
2-6 group material(e.g. CdTe, CdS, CdSe) is utilized as a photoconductor at the bulk level unlike as a phosphor when manufactured at the nanoscale level. Conceived by this fact, one invented an x-ray detector which hybridized two different kinds of layers from one material, which was acted as a photoconductor in the bulk state and also worked as a phosphor at the nanoscale. This system works...
Mr
Kyung-min Oh
(Department of Biomedical Engineering, Inje University, Gimhae 621-749, Republic of Korea)
7/4/11, 12:50 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
A variety of direct X-ray conversion materials have been studied to develop digital mammography. Since direct conversion materials, such as HgI2, PbI2, and PbO have high X-ray conversion efficiency comparing to indirect X-ray conversion materials like CsI(Tl) and NaI, direct conversion materials are suitable for digital mammography which requires high spatial resolution at low exposure rate....
YOUNG KYU Lee
(Department of Biomedical Engineering, Inje University, Gimhae 621-749, Republic of Korea)
7/4/11, 12:51 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
This study shows each photoconductor properties of PhotoInduced Discharge X-ray detector. a-Se via former used TFT has many problems. These problems are row yields from TFT manufacture and image quality decrease from its noise. a-Se case especially, duration of manufacture and row yields and circuit damage from high voltage polarizing are significant problems. To overcome problems using a-Se,...
Ms
Hye Jin Park
(Medical image & science, Inje University, Gimhae, Gyeongnam, Republic of Korea)
7/4/11, 12:52 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
X-ray detection, phosphor material of high resolution and high effectiveness has been researched. Rare Earth phosphor material had been used for a long time due to high atomic number and quality efficiency. But, generalization phosphors have a lot of problems with resolution and efficiency that being manufactured by Bulk phosphor. In this paper, Gd2O3:Eu3+, Y2O3:Eu nano phosphor on...
Mr
Hanbean Youn
(School of Mechanical Engineering, Pusan National University)
7/4/11, 12:53 PM
Sensor Materials, Device Processing & Technologies
Poster presentation
It has been greatly paid attention in the development of novel x-ray imaging technologies based on single-photon energy measurements for superior image quality with a reduced patient dose. While the promise of this research is exciting, we are at an early stage in the design of energy-resolving detectors. To be successful, it is critical that we fully understand what detector designs have the...
