A5087038781- Radiation Detection and Scintillator Technologies
- Radiation Effects and Dosimetry
- Luminescence Properties of Advanced Materials
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Advanced Radiotherapy Techniques
- Graphite, nuclear technology, radiation studies
- Radiation Dose and Imaging
- Advanced Optical Sensing Technologies
- Radiation Effects in Electronics
- Radioactivity and Radon Measurements
- Radioactive contamination and transfer
- Radiation Shielding Materials Analysis
- Analytical Chemistry and Sensors
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Semiconductor Detectors and Materials
- Radioactive element chemistry and processing
- Nuclear Materials and Properties
- Advanced Chemical Sensor Technologies
- Advanced Fiber Laser Technologies
- Glass properties and applications
- Semiconductor Quantum Structures and Devices
- Digital Radiography and Breast Imaging
- Atomic and Subatomic Physics Research
- Calibration and Measurement Techniques
Korea Atomic Energy Research Institute
2017-2024
Electron paramagnetic resonance, thermoluminescence, and optically stimulated luminescence, with biological tissues inert materials are well established physical methods for retrospective dosimetry in acute accidental exposures. The objective of this article is to provide a view the questions still open, current challenges needed solutions. As research on emergency response encountering increasing difficulties terms financial human resources many countries, it essential identify priorities...
When radiation exposure occurs, evaluating the dose is necessary to assess risk and implement appropriate protective measures. Typically, workers use personal dosimeters, which conservatively calculate effective based on measured values. However, in scenarios involving potential high exposure, emergency response tasks, or accidental precise evaluation crucial. Conventional methods estimate human from dosimeter readings by applying dosimeter-to-human conversion factors under assumption of a...
Smart chip cards are a promising material in retrospective dosimetry due to their high collectability with low replacement cost. In this study, dose reconstruction using OSL at elevated temperatures for various was investigated. The approximate spectral emission of the determined through comparison radiation-induced and intrinsic background TL signals different detection filters. decay curve, fast component (0.0–0.4 s) integrated avoid signals. To minimize sensitivity changes heat treatment,...
This study presents the development and characterization of a prototype TL/OSL reader for retrospective dose assessment individuals in radiological emergencies. The is portable, semi-automatic, capable accurate measurements. dimension 25×25×37 cm3 weight about 15 kg. consists sample moving stage, heating module, an optical stimulation detection data acquisition (DAQ) unit, nitrogen gas control PC with GUI program. has three measurement modes: TL, CW_OSL, custom mode. was characterized using...
Luminescence dosimetry could be an essential tool in retrospective for assessing absorbed dose after a radiological overexposure. Mobile phone components useful proxies measuring the amount of individual has received. Different research groups have extensive experience characterising different elements mobile phones (i.e. electronic components, display or touch screen glass) physical dosimetry. However, so far these techniques are frequently destructive and alternative materials need to...
An inter-laboratory comparison of a small-scale field experiment was conducted in the framework Korea retrospective dosimetry network (KREDOS) to verify reliability and compatibility thermoluminescence optically stimulated luminescence techniques for accident dosimetry. Three institutes participated this comparison, including Atomic Energy Research Institute, Institute Nuclear Safety University Salzburg. Two adult CIRS torso phantoms were used as virtual subjects exposed high-activity Ir-192...
A thermally assisted optically stimulated luminescence protocol for the use of display glass samples from mobile phones as a fortuitous dosimeter was developed. Glass 16 different Samsung Galaxy series were used. The consists prebleach with LEDs 470 nm 500 s and an OSL reading at elevated temperature. decay curves measured temperatures 100 to 400 °C in interval 50 °C. significant baseline increase observed above 350 For TA-OSL below 300 °C, dose response 10 mGy Gy linear signals reproducible...
In this paper, the single-photon avalanche diodes (SPADs) featuring three different p-well implantation doses (∅p−well) of 5.0×1012, 4.0×1012, and 3.0×1012 atoms/cm2 under identical device layouts were fabricated characterized to evaluate effects field enhanced mechanisms on primary dark pulses due maximum electric field. From I–V curves, breakdown voltages found as 23.2 V, 40.5 63.1 V with decreasing ∅p−well, respectively. By measuring DCRs a function temperature, we reduction approximately...
When neutron survey metres are calibrated in fields, the results for room- and air-scattered neutrons vary according to distance from source size, shape construction of calibration room. ISO 8529-2 recommends four approaches correcting these effects: shadow-cone method, semi-empirical generalised fit method reduced-fitting method. In this study, scattering effects evaluated compared using methods field Korea Atomic Energy Research Institute (KAERI). The is constructed a 252Cf positioned...
The Korea Retrospective Dosimetry network (KREDOS) performed an inter-laboratory comparison to confirm the harmonization and reliability of results retrospective dosimetry using mobile phone. phones were exposed 192Ir while attached human phantoms in field experiment, exposure doses read by each laboratory compared. This paper describes reference present values for inter-comparison obtain additional information about dose distribution. Reference included both measurement LiF:Mg,Cu,Si...
This paper presents the results of first intercomparison exercise performed by Korea retrospective dosimetry (KREDOS) working group using electron paramagnetic resonance (EPR) spectroscopy. The employed alanine dosimeter, which is commonly used as standard dosimeter in EPR methods. Four laboratories participated dose assessment blind samples, and one laboratory carried out irradiation samples. Two types dosimeters (Bruker Magnettech) with different geometries were used. Both blindly...
Highlights• The usage history of a sample carrier has non-negligible impact on the signal sensitivity.• Heat exposure results in reduction reflectance.• General recommendations for measuring luminescence materials are given.
To ensure precise luminescence measurements, it is crucial to carry out measurements on clean sample carriers. Moreover, essential that the light emitted by studied reproducibly reflected towards detector, particularly when exhibits dim luminescence. This study reports observations made three laboratories working in field of retrospective dosimetry. The discusses results obtained using new carriers (made stainless steel), instead previously heated a temperature 450 °C. article describes...
The employment of silicon photomultipliers (SiPMs) in photon detection systems facilitates the reduction module size, enhances portability and ruggedness, lowers product costs. This study investigated potential SiPM thermoluminescence (TL) measurements, focusing on its limits, temperature dependency, dose responses. A 3×3 mm2 multi-pixel counter (MPPC, Hamamatsu MPPC) composed 50 μm single-photon avalanche diodes (SPADs) was utilized counting mode as detector. experimental setup compared...
This paper explores the implementation of machine learning-based algorithms for TL dose assessment. It focuses on radiation field classification, performance quotient evaluation, and shallow deep equivalent assessment ANN LGBM, in comparison to traditional method DT. We evaluate these based element response data measured by TLD. A set was built training, base responses test categories were amplified, normalized 1 mSv Cs-137 within range ±3 %. Both consist five subset models classifying...
Investigations of retrospective dosimetry have shown that components mobile phones are suitable as emergency dosimeters in case radiological incidents. For physical dosimetry, can be read out using optically stimulated luminescence (OSL), thermoluminescence (TL) and phototransferred (PTTL) methods to determine the absorbed dose. This paper deals with a feasibility study display glass from modern measured by thermally assisted (Ta) luminescence. Violet (VSL, 405 nm) infrared (IRSL, 850 LEDs...