نتایج جستجو برای: alpha radiation
تعداد نتایج: 437335 فیلتر نتایج به سال:
Radiotherapy is a fundamental part of cancer treatment but its use is limited by the onset of late adverse effects in the normal tissue, especially radiation-induced fibrosis. Since the molecular causes for fibrosis are largely unknown, we analyse if epigenetic regulation might explain inter-individual differences in fibrosis risk. DNA methylation profiling of dermal fibroblasts obtained from b...
Macrophages are activated to become cytotoxic by a highly coordinated set of cytokine signals. Ionizing radiation can mimic cytokine signals and lead to enhanced states of activation. We tested the ability of gamma-radiation, alone and with interferon-gamma (IFN-gamma) and/or lipopolysaccharide (LPS), to induce nitric oxide (NO) production in J774.1 and RAW264.7 murine macrophages. NO was induc...
The results of research on the application method measurement gross alpha-, beta-activity in water using liquid scintillation counter (LSC) Quantulus 1220 are presented. Basic procedures preparation and spectrometric aqueous samples were studied performed. detection efficiency beta-particles depending quenching optimum beta-radiation separation parameter for used determined. Testing validation ...
Introduction: 238U decays with alpha particles emission into 234Th and the series ends with 206Pb. The unstable nucleus loses the energy with emitting ionizing alpha particles for reaching a stable state. It is undergoing alpha decay with decay energy (4.679 MeV). Alpha particles enter the human and animal bodies through inhalation of air or ingestion of contaminated food and water. This study ...
We examine the cooling radiation from forming galaxies in hydrodynamic simulations of the LCDM model (cold dark matter with a cosmological constant), focusing on the Lyα line luminosities of high-redshift systems. Primordial composition gas condenses within dark matter potential wells, forming objects with masses and sizes comparable to the luminous regions of observed galaxies. As expected, th...
0026-2714/$ see front matter 2008 Elsevier Ltd. A doi:10.1016/j.microrel.2008.06.047 * Corresponding author. Address: LAAS CNRS, 7, Toulouse Cedex 4, France. Tel.: +33 561337900; fax: E-mail address: [email protected] (G. Papaioannou) The paper investigates the effect of 5 MeV alpha particle irradiation in RF MEMS capacitive switches with silicon nitride dielectric film. The investigation includ...
We experimentally study the real-time susceptibility of trapped-ion quantum systems to small doses ionizing radiation. expose an ion-trap apparatus a variety $\alpha$, $\beta$, and $\gamma$ sources measure resulting changes in qubit lifetimes, coherence times, gate fidelities, motional heating rates. found no quantifiable degradation ion trap performance presence low-dose radiation for any meas...
The hazard of ionizing radiation from internally administered colloidal thorium dioxide (Thorotrast) has been a subject of controversy even since this medium was first employed in clinical roentgenology. Reports of neoplasia as well as diffuse hepatic fibrosis occurring in patients following Thorotrast administration have been summarized and evaluated by Thomas et al.7 Although intravenous inje...
در این پایان نامه یک روش عددی برای حل معادلات کسری-زمانی و کسری-فضایی برگر egin{equation*} d_t^{alpha}u+varepsilon uu_{x}= u u_{xx}+eta d_x^{eta}u, end{equation*} معادله ی کسری-زمانی و کسری-فضایی پوآسن egin{equation*} d_x^{eta}u + d_t^{alpha}u = f(x,t), end{equation*} و معادله ی کسری-زمانی انتشار egin{equation*} d_t^alpha u+u=k abla^2 u + f(x,t), end{equation*} ...
Radiological terrorism and use of nuclear weapons are major concerns for national defense and homeland security. At low doses of radiation, the hazards from these scenarios may not be apparent immediately, but may result in late arising pathologies like cancer and pulmonary fibrosis. At high doses, the hazards vary from incapacitation due to nausea and diarrhea to mortality. Free radical specie...
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