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Showing 1-25 of 1,164 resultsfor "Index Terms":Number Of Doses
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Analysis of Current Assessments and Perspectives of ESR Tooth Dosimetry for Radiation Dose Reconstruction of the Population Residing Near the Semipalatinsk Nuclear Test Site
Between 1949 and 1989 the Semipalatinsk nuclear test site (SNTS), an area of 19,000 square km in northeastern Kazakhstan, was the location of over 400 nuclear test explosions with a total explosive energy of 6.6 Mt TNT (trinitrotoluene or trotyl) equivalent. It is estimated that the bulk of the radiation exposure to the population resulted from three tests, conducted in 1949, 1951, and 1953 althou...Show More
Correlation Between High Dose Rate Irradiation and Low Dose Rate Irradiation for Switched Dose Rate Technique
Based on gated lateral p-n-p (GLp-n-p) transistors, the correlation between the high dose rate (HDR) and low dose rate (LDR) irradiations during the switched dose rate experiments is investigated. Experimental results show that a significant deviation of the current gain degradation caused by switching dose rate irradiations from that by individual LDR ones is found. It is also observed that, afte...Show More
Radiation Test Performance of the Intel Loihi Neuromorphic Processor
2024 IEEE Space Computing Conference (SCC)
Year: 2024 | Conference Paper |
The emerging paradigm of neuromorphic computing has the potential to provide high-performance, low-power computing for edge artificial intelligence. This promise of high performance and low power consumption makes neuromorphic computing devices attractive for platforms at the edge: those that are constrained in size, weight, and power. Spacecraft fall into the category of edge platforms. In space,...Show More
Multiple dose vaccination against childhood diseases: high coverage with the first dose remains crucial for eradication
The high vaccination coverage required to eradicate communicable diseases like measles, mumps and rubella, with a single dose of vaccine, has prompted many countries to introduce a second dose. In this paper we investigate the conditions to eradicate childhood diseases with multiple doses of vaccine by obtaining explicit analytical solutions to the classical compartment model that assumes an age-i...Show More
Biological Effects of Intermittent Radiation in Cultured Tumor Cells: Influence of Fraction Number and Dose Per Fraction
In intensity-modulated radiation therapy (IMRT) and stereotactic irradiation using a linear accelerator, radiation is administered intermittently and one treatment session often requires 30 min or a longer time. The purpose of the present study was to investigate the effect of fractionation and dose per fraction on cell killing by irradiation in intermittent exposure. Murine EMT6 and SCCVII cells ...Show More
Analysis of Image Lag Degradation in PPD CISs Induced by Total Ionizing Dose and Displacement Radiation Damage
Zujun Wang;Yuanyuan Xue;Jing Liu;Wei Chen;Wuying Ma;Baoping He;Zhibin Yao;Jiangkun Sheng
2017 17th European Conference on Radiation and Its Effects on Components and Systems (RADECS)
Year: 2017 | Conference Paper |
The experiments of the total ionizing dose (TID) and displacement radiation effects on the pinned photodiode (PPD) CMOS image sensors (CISs) are presented. The CISs are manufactured using a standard 0.18 μm CMOS technology with 4 Megapixels and 4-transistor PPD pixel architecture. The image lag degradation induced by TID damage is analyzed by exposing the 60Co γ rays with different biased conditio...Show More
Repair of Skin Damage During Fractionated Irradiation with Gamma Rays and Low-LET Carbon Ions
In clinical use of carbon-ion beams, a deep-seated tumor is irradiated with a Spread-Out Bragg peak (SOBP) with a high-LET feature, whereas surface skin is irradiated with an entrance plateau, the LET of which is lower than that of the peak. The repair kinetics of murine skin damage caused by an entrance plateau of carbon ions was compared with that caused by photons using a scheme of daily fracti...Show More
Dependence of Malformation upon Gestational Age and Exposed Dose of Gamma Radiation
In order to evaluate the importance of gestational age and the dose-incidence relationship by gamma radiation, pregnant ICR mice at gestational days from 2.5 to 15.5 days post-coitus (p.c.) were exposed to a single dose of 2.0 Gy and also at day 11.5 after conception, which was the most sensitive stage for the induction of major congenital malformations. The animals were sacrificed on day 18 of ge...Show More
Low-dose-rate radiation exposure leads to testicular damage with decreases in DNMT1 and HDAC1 in the murine testis
This study examined the effects of continuous low-dose-rate radiation exposure (3.49 mGy/h) of gamma rays on mice testicles. C57BL/6 mice were divided into sham and radiation groups (n = 8 each), and were exposed to either sham irradiation or 2 Gy for 21 days, 0.2 Gy for 2 days, or 0.02 Gy for 6 h of low-dose-rate irradiation. Testicular weight, seminiferous tubular diameter, and seminiferous epit...Show More
Radiation Testing of a Flash NAND Device
2017 IEEE Radiation Effects Data Workshop (REDW)
Year: 2017 | Conference Paper |
Cited by: Papers (2)
Total ionizing dose and single event effects testing was performed on 4 Gb NAND flash die used in DDC's 69F24G24 flash NAND devices. If the data is regularly refreshed, the devices show good resistance to corrupted bits during total dose irradiation. In the case of heavy ion irradiation, multi-bit upsets could prove problematic to some error correction schemes.Show More
Static Characteristic Recovery of SiC MOSFETs Induced by Dynamic Gate Stress after Total Ionizing Dose Irradiation
Jiahao Hu;Xiaochuan Deng;Xing Zeng;Tao Xu;Haibo Wu;Xuan Li;Bo Zhang
2024 IEEE 17th International Conference on Solid-State & Integrated Circuit Technology (ICSICT)
Year: 2024 | Conference Paper |
More defects at the $\text{SiC}/\text{SiO}_{2}$ interface of SiC MOSFETs cause the decrease in the static parameters to be particularly significant when the SiC MOSFETs gate oxide is subjected to a certain extent of stress. In this paper, the variation in the static characteristics of SiC MOSFETs with total ionizing dose (TID) irradiation and dynamic gate stress is fully studied. After TID irradia...Show More
Application of p-Channel Power VDMOSFET as a High Radiation Doses Sensor
This paper presents a comparative study of RADFETs and commercial p-channel power VDMOSFETs sensitivity to gamma-ray irradiation. Sensitivity was characterized by the threshold voltage shift determined from extrapolated linear region of transfer characteristics in saturation as a function of radiation dose. Sensitivity was followed in the dose range from 100 Gy to 500 Gy without and with $ + 10~\h...Show More
Dose-response Relationship for Induction of Solid Tumors in Female B6C3F1 Mice Irradiated Neonatally with a Single Dose of Gamma Rays
Journal of Radiation Research
Cited by: Papers (1)
Our previous studies showed that mice during infancy are highly susceptible to the induction of several types of solid tumors. The present study was designed to elucidate the dose-response relationships for induction of solid tumors after exposure to 0.48–5.70 Gy of 137Cs gamma rays in the neonatal period in female mice. A total of 2988 mice were allowed to live out their life span under a specifi...Show More
Initial Symptoms of Acute Radiation Syndrome in the JCO Criticality Accident in Tokai-mura
Journal of Radiation Research
Cited by: Patents (1)
A criticality accident occurred on September 30, 1999, at the uranium conversion plant in Tokai-mura (Tokai-village), Ibaraki Prefecture, Japan. When the criticality occurred, three workers saw a “blue-white glow,” and a radiation monitor alarm was sounded. They were severely exposed to neutron and γ-ray irradiation, and subsequently developed acute radiation syndrome (ARS). One worker reported vo...Show More
Cytogenetic Effects of Low Doses of Energetic Carbon Ions on Rice After Exposures of Dry Seeds, Wet Seeds and Seedlings
In order to investigate the biological effects of heavy ion radiation at low doses and the different radiosensitivities of growing and non-growing plants, rice at different lift stages (dry seed, wet seed and seedling) were exposed to carbon ions at doses of 0.02, 0.2, 2 and 20 Gy. Radiobiological effects on survival, root growth and mitotic activity, as well as the induction of chromosome aberrat...Show More
Consideration of the usefulness of a size-specific dose estimate in pediatric CT examination
Computed tomography (CT) has recently been utilized in various medical settings, and technological advances have resulted in its widespread use. However, medical radiation exposure associated with CT scans accounts for the largest share of examinations using radiation; thus, it is important to understand the organ dose and effective dose in detail. The CT dose index and dose–length product are use...Show More
In vivo measurement of dose distribution in patients' lymphocytes: helical tomotherapy versus step-and-shoot IMRT in prostate cancer
In radiotherapy, in vivo measurement of dose distribution within patients' lymphocytes can be performed by detecting gamma-H2AX foci in lymphocyte nuclei. This method can help in determining the whole-body dose. Options for risk estimations for toxicities in normal tissue and for the incidence of secondary malignancy are still under debate. In this investigation, helical tomotherapy (TOMO) is comp...Show More
Influence of Fin and Finger Number on TID Degradation of 16-nm Bulk FinFETs Irradiated to Ultrahigh Doses
Teng Ma;Stefano Bonaldo;Serena Mattiazzo;Andrea Baschirotto;Christian Enz;Alessandro Paccagnella;Simone Gerardin
This article investigates the fin- and finger-number dependence of the total ionizing dose (TID) degradation in 16-nm bulk Si FinFETs at ultrahigh doses. n- and p-FinFETs designed with different numbers of fins and fingers are irradiated up to 500 Mrad(SiO2) and then annealed for 24 h at 100 °C. The TID responses of nFinFETs are insensitive to the fin number, as dominated by border and interface t...Show More
Applicability of the linear–quadratic model to single and fractionated radiotherapy schedules: an experimental study
The aim of this study was to examine the applicability of the linear-quadratic (LQ) model to single and fractionated irradiation in EMT6 cells. First, the α/β ratio of the cells was determined from single-dose experiments, and a biologically effective dose (BED) for 20 Gy in 10 fractions (fr) was calculated. Fractional doses yielding the same BED were calculated for 1-, 2-, 3-, 4-, 5-, 7-, 15- and...Show More
Cytogenetical Dose Estimation for 3 Severely Exposed Patients in the JCO Criticality Accident in Tokai-mura
A dose estimation by chromosome analysis was performed on the 3 severely exposed patients in the Tokai-mura criticality accident. Drastically reduced lymphocyte counts suggested that the whole-body dose of radiation which they had been exposed to was unprecedentedly high. Because the number of lymphocytes in the white blood cells in two patients was very low, we could not culture and harvest cells...Show More
In current computed tomography (CT) architecture, both X-ray tubes and X-ray detectors are rotated mechanically around an object to collect a sufficient number of projections. This architecture has been shown to not be fast enough for patients with high or irregular heart rates. Furthermore, both X-ray beams and detectors of the current architecture are made wide enough, so that the entire object ...Show More
High Incidence of Micronuclei in Lymphocytes from Residents of the Area near the Semipalatinsk Nuclear Explosion Test Site
The Semipalatinsk area is highly contaminated with radioactive fallout from 40 years of continuous nuclear testing. The biological effects on human health in this area have not been studied. Significant remaining radioactivities include long-lived radioisotopes of 238,239,400Pu, 137Cs and 90Sr. To evaluate the long-term biological effects of the radioactive fallout, the incidence of micronuclei in...Show More
Tumor Induction in Mice Locally Irradiated with Carbon Ions: A Retrospective Analysis
Tumor induction in mice legs that were locally irradiated with carbon ions was compared to tumor induction by γ rays after single and fractionated irradiation. A total of 250 tumors were induced in 1104 mice that received carbon-ion doses of 5 through 65 Gy. A total of 77 tumors were induced in 371 mice that received γ-ray doses of 45 through 95 Gy. Of 91 carbon-ion induced tumors examined histolo...Show More
Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
Institutional imaging protocols for the verification of brachytherapy applicator placements were investigated in a survey study of domestic radiotherapy institutions. The survey form designed by a free on-line survey system was distributed via the mailing-list system of the Japanese Society for Radiation Oncology. Survey data of 75 institutions between August 2019 and October 2019 were collected. ...Show More
Enhanced Total Ionizing Dose Response of 16 nm n-FinFETs With a Single Fin
Xuewen Wei;Jiangwei Cui;Deng Luo;Gang Yu;Yudong Li;Qi Guo;Qiwen Zheng
IEEE Electron Device Letters
Cited by: Papers (2)
In this letter, total ionizing dose (TID) response of bulk n-type Fin Field-Effect Transistor (n-FinFET) is investigated with the various number of fins. Experiments show that only the single fin n-FinFET exhibits significant radiation damage, while the degradation of multi-fin devices is observed to be minimal. 3D TCAD simulations indicate that relative positions between fins and STI play a criti...Show More
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