Equations for a bi-localized system with quasi-equilibrium conditions are considered. The system is solved analytically for TL (thermoluminescence) and OSL (optically stimulated luminescence). TL curve has a double peak structure.
Optically Stimulated Luminescence (OSL) intensity is enhanced upon interaction with Localized Surface Plasmons (LSP) but the exact mechanism is still not clear. Our results suggest that trapped electrons optically unreachable can be converted into useful luminescence information via plasmonic coupling. As a consequence, higher dosimetric sensitivity and smaller bleaching times are obtained.
A novel method for the detection of glow curves (GCs) anomaly is presented. The method uses machine learning algorithms in order to detect abnormal GCs shapes and categorize them. A high detection performance rate for either ‘anomalous’ or ‘regular’ GC shape class of up to 96% is achieved, depending on the algorithm type.
Experimental and theoretical regularities of the compensation effect observed are studied on the example of the analysis of thermally stimulated kinetics in the luminescence mechanisms of irradiated dosimetric materials.
Several kinds of luminescence from electric components of mobile devices induced by irradiation (RL), thermal stimulation (TL), optical stimulation (OSL) and their combinations (PTTL, TA-OSL etc.) were studied in both aspects of experimental and theoretical.
Photoluminescence and thermostimulated luminescence of LiGaO2 crystal was studied in 10-500 K temperature region after UV irradiation. Luminescence mechanisms were elucidated. TL peak at 350 K and the corresponding emission spectrum in visible region makes LiGaO2 potentially applicable as material for TL dosimetry.
Ionizing radiation induced color centers in KMgF3:Tm fluoroperovskite. UV and blue emission from thulium doped-polycrystal was observed. KMgF3:Tm [1 mol %] displays several thermoluminescent (TL) peaks in an aceptable temperature range suitable for ionizing radiation dosimetry.
The F and F+ bands associated with radioluminescence in Al2O3:C,Mg are affected by thermal quenching but the behaviour for the F+ band depends on prior annealing.
We recorded the scintillation temporal profiles of CdWO4 under different linear energy transfers (LETs). The LET dependence was analyzed from the viewpoint of quenching due to excited state interaction.
Oxygen dangling bonds (“non-bridging oxygen hole centers”, NBOHCs), are peculiar to amorphous state of SiO2 and cannot be induced in α-quartz by purely ionizing irradiation. Their presence in quartz normally is an indication of particle-induced damage. Here were detected NBOHCs for the first time in high-dose electron-irradiated α-quartz crystal. Their presence may signal the formation of nucleation centers in crystal structure as the first step to radiation-induced amorphization just below the amorphization threshold.
Specific changes have been discovered in the photoluminescence kinetics of F centers in anion-deficient corundum crystals over the temperature range of 200-700 K. In the intervals 290£Tmeas£370 K and 420£Tmeas£700 K, the fast component tfast equal to the F center lifetime in excited state tF has a slow component with tslow occurring alongside it. The contribution of the slow component and its time constant are maximal at the beginning and minimal at the end of each of these intervals.
An improved Monte Carlo method for calculating TL in a cluster system is proposed. New cluster TL model with deep electron trap is analyzed by Monte Carlo method. TL dose dependencies are simulated for the first time in a cluster system. The heating rate effect on superlinearity of TL dose response was found using the model under study.
The TM-OSL method applied to separate the slow OSL component in quartzParameters of trap responsible for the slow componentDose response curve of the slow component observed in TM-OSL measurements
The dosimetric characteristics of three types of smartphone screen protective films were confirmed by electron paramagnetic resonance (EPR) spectroscopy. The tempered glass (TG) film showed similar characteristics to the touchscreen glass so that it could be used as a dosimetry sample instead of touchscreen glass in radiation accident.
Ox bone, clam shell, cyclina shell, chitin, tooth, and fingernail can be used as the environmental dosimeters. Linear dose-response curves of ox bone, clam shell, cyclina shell, chitin, tooth, and fingernail are presented. The grain size and storage temperature of the materials on the sensitivity of EPR spectra are examined.
The natural signals emitted by polymineral fine grains (post-IR IRSL290 and post-IR IRSL225 protocols) and by 63-90 µm quartz SAR-OSL, enter field saturation for samples immediately below the Eemian palaeosol (500 Gy, 400 Gy and 300 Gy, respectively). Although the laboratory dose response curves on 4-11 µm quartz grow beyond 5000 Gy, accurate ages are obtained only for samples from the last interglacial-glacial cycle (<240 Gy). The measurable range of doses for each signal depends on the degree of overlap between the natural and laboratory dose response curves.
We present infrared stimulated luminescence (IRSL) ages of Spituk Lake deposits in Ladakh, India. The IRSL ages for seven samples from the Spituk section range from 105 to 170 ka, and suggest that deposition in the Spituk area began at ~170 ka after damming of the Indus River. These ages are substantially older than ~50,000 years BP reported previously by Phartiyal et al (2005). The uppermost unit in this section marks a change in climate and fluvial activity and the IRSL ages suggest that lake existed for another ~70 ka, and later disappeared due to breaching of the dam at ~100 ka.
Sediment dating by EPR was successfully performed. Signal of E´1 center was used.
Equivalent dose dependence on emission wavelength is resolved both within and across the main emission bands of quartz and feldspar using an automated spectrometer. This is the first systematic dating study using spectrally-resolved OSL/TL.
Characteristics of thermoluminescence of SIM cards in South Korea for accident dosimetry were identified.
Analysis of the thermoluminescence (TL) signal and inherence physical characteristics of resistor elements in the electronic personal dosimeter (EPD) was performed. Then the estimated accident dose was derived by using measurement of TL from resistor extracted from the EPD and verified the results.
Computational modelling of beta dose rate in heterogenous materials
Stimulated luminescence properties of limestone (CaCO3) collected from the Mawsmai Cave, India have been studied using thermoluminescence (TL) and infrared light stimulated luminescence (IRSL) techniques. The radiation dosimetric features of the sample have been assessed.
Human fingernails were used to evaluate the exposed dose in a radiation accident situation. The characteristic of radiation induced signal in Korean fingernails were researched by the EPR dosimetry.
OSL (Optically Stimulated Luminescence) dosimetric properties of silica chip present in RFID (Radio Frequency IDendification) based identity cards were studied for emergency retrospective dosimetry. The protocol for retrieval of the absorbed dose was developed using SAR (Single Aliquot Regenerative Dose).
Resistor TL/OSL zero-dose is very important to TL/OSL retrospective dosimetry using electric personal dosimeter (EPD). We evaluated the zero-dose for the resistor TL/OSL signal, respectively. We also examined the thermal and optical dependence of the zero-dose.
Optically stimulated luminescence properties of smart chip cards were identified.
Dosimetry of a gamma-irradiated phantom exposed in different geometries. Dose estimation using MC simulations and comparison with experimental measurements using external smartphones and internals TLDs. Calculations of conversion factor for dose from smartphones to dose to internal organs.
ESR intensity for E1′ center increased linearly on new surfaces of quartz grains formed by brittle fracture. This result implies that E1′ center can be increased by various fault motions without frictional heating: brittle fracture of seismic fault movement fault creep, landslide and so on. E1′ center can also be an index of displacements of such fault motions.
Memory cards from mobile phones have potential as fortuitous individual dosimeters; two OSL emissions at 330 and 370-390 nm; linear dose-response to several Gy; assessment of detection limit and signal fading
Pulsed Electron Spin Resonance (P-ESR) technique for tooth-based dosimetry shows great promise in providing direct estimate of spin concentration without a-priori knowledge of the measured tooth volume. The proposed technique could be used as a basis for accurate retrospective dosimetry.
The PTTL method for an additional independent measure on the glass material extracted from mobile phones is tested as a tool for retrospective dosimetry.
Monte Carlo simulation was performed to reconstruct a body dose from a mobile phone dose. Doses were calculated with the different size of mesh phantoms for various exposure conditions.
Optical dating was carried out for the early Neolithic potteries collected from the Gosan-ri site. Gosan-ri-type pottery known as the oldest pottery in Korea was manufactured and utilised from the late 8th century BC. Gosan-ri site was formed after the late 10th century BC and had been lasted during about 500 years.
Fossils of mammals found in Mirim Lake, southern Brazil were dated by ESR and OSL, providing consistent results with site stratigraphy and literature data from nearby sites.
We have tested the applicability of the post-infrared infrared stimulated luminescence dating of 90-150 mm quartz grains in five dune samples collected from a ~3.5 m deep trench near Ramanathapuram, Tamil Nadu. The pIRIR ages are stratigraphically consistent, and suggest aeolian activation began in this region before 60 ka, and continues until 2000 years ago.
Dosimetric properties of optically stimulated luminescence (OSL) from human fingernails are presented and their possible application to retrospective dosimetry of a hand exposure is discussed.
The time dependent behaviors of electron spin resonance (ESR) signals from fingernails were different between different-quality radiations; this fact should be considered carefully for standardization of fingernail ESR as a retrospective dosimetry for radiological accident.
Ag-doped phosphate glass was assessed as a potential high-dose dosimeter using radiophotoluminescence (RPL), optical absorption (OA), thermoluminescence (TL) and electron paramagnetic resonance (EPR). OA and EPR responses demonstrated a monotonic increase with dose and, with the proper calibration, may be used for dosimetry up to several hundreds of kGy.
The present study shows a geochronological novel data of the Solimões-Amazonas river system’s Holocene lower terrace, range between the Manacapuru and Madeira river mouths, Central Amazonia. To improve the precision of the young ages sediments, comparisons between the ages found by central age (CAM), minimum age (MAM) and finite mixture model (FMM) models were made and ages between 2.9 to 9.7 kyears were evaluated.
Detection limit of the electron spin resonance (ESR) dosimetry using tooth enamel of Japanese macaque, extracted by a novel enamel-dentine separation technique, was estimated to be ~40 mGy. The external exposure dose for Japanese macaques collected in Fukushima prefecture were estimated.
Towards the effective use of porcelain samples to accidental retrospective dosimetry applications, new experimental data are presented, including a comparison of luminescence features among various porcelain-based items collected from Turkey.
Improvement of eye lens dosimetry and potential for high ocular radiation doses to interventional radiology and cardiology staff. The obtained dosimetry data could be used for epidemiological studies to assess retrospectively eye lens dose.
Highlights項目なしタイトル：Measurement of the eye lens radiation exposure in interventional urology using Al2O3:C OSL dosimeters
Possibility of dose reassessment by using phototransferred method to the height sensitive thermoluminescent MCP-N detectors applied to environmental and eye lens dosimetry.
The features of X-ray tube and assessed doses for relative person and working environments for X-ray diagnostic imaging and nuclear medicine processes were investigated in this paper. More than 250 veterinary hospitals using X-ray machines and a hospital performing veterinary nuclear medicine in Taiwan were assessed.
For the estimation of dose reduction effect by shielding vest, exposure tests by 137Cs source and X-ray generator were done using water phantom covered with shielding vest made of heavy metal. That effect including of photon energy dependence was also surveyed by the Monte Carlo simulations.
For the quality control of blood irradiators, a jig for irradiation of alanine dosimetry is produced, and the dose distribution and uncertainty of blood irradiator container are evaluated using EPR spectroscopy.
Tooth enamel samples from staff of the uranium mining enterprise in comparison with the population of the control territory have been investigated by the EPR dosimetry method.
Peter MacCallum Cancer Centre (Peter Mac) is a dedicated oncology hospital providing nuclear medicine, radiation therapy, and radiology services. It also includes a large research department that uses X-ray devices and unsealed radioactive material. Currently, approximately 28 % of Peter Mac staff is monitored for personal dose equivalent (Hp10). In 2007 the type of dosimeter and provider was changed from a thermoluminescent detector (TLD) to optically stimulated luminescence detector (OSL) dosimeter. An examination of the Peter Mac occupational radiation dose register showed a marked decrease in the average Hp10 when use of the OSL dosimeter commenced.
Instead of using a set standard samples of irradiated tooth enamel, tempol is shown to be useful in ESR (electron spin resonance, or EPR) retrospective dosimetry to determine the doses given to tooth enamel.
The method of ESR (EPR) dosimetry is applied to cattle tooth enamel to obtain retrospective radiation doses by Fukushima Dai-ichi Nuclear Power Plant accident in 2011. The obtained doses are up to 1.2 Gy, being roughly consistent with the accumulated environmental dose rates. The study shows that mammal tooth enamel is useful in ESR dosimetry.
All the categories of performance of current 8 tested laboratories meet the ANSI/HPS N13.11-2009(R2015) criteria and the reanalysis results were suggested to be an important step of an accreditation procedure for the personnel dosimetry system in Taiwan.