Abstract Single crystalline tungsten was irradiated by the medium-mass ion Si with 7.5 MeV and high mass-ion W 20.3 up to a calculated peak damage level of 0.04 dpa 0.5 dpa. The obtained dislocation structure zone investigated transmission electron microscopy systematically compared each other. Bright-field kinematical images were taken under four different two-beam diffraction conditions g = −...

In our previous studies carried out on inbred Sprague-Dawley rats, we reported a striking increase in the incidence of tumors following total-body gamma-irradiation [150 rads (1.5 Gy) five times at weekly intervals]. Subsequently, we observed that two or three irradiations, and to a lesser extent even a single irradiation, were sufficient to induce an impressive increase in the incidence of tum...

Members of the protein kinase C (PKC) gene family have been shown to play an important role in tumor promotion and regulation of cell growth. Experiments were designed to examine the effects of different qualities of ionizing radiation administered at a variety of doses and dose rates on the expression of PKC-specific mRNA in confluent Syrian hamster embryo cells. The results of these experimen...

The production of certified reference materials in Brazil, and the consequent availability to national end users, is an important task for the enhancement of Metrology in Chemistry status in the country, as these materials are used for method validation, equipment calibration and for establishing metrological traceability links. In this study, Instrumental Neutron Activation Analysis (INAA) was...

Following the exposure of mice to X rays or fission neutrons, the frequency (F) of apoptosis was measured after 4 h, and the weight loss or lymphocyte content loss in the thymus and spleen was measured after 24 h. In p53(+/+) mice, F increased linearly with the dose (D (Gy)) and the induced rate per Gy of F (detected by TUNEL staining) was 0.05 and 0.23 for X rays and fission neutrons, respecti...

*Corresponding author: Dr. Tayyeb Allahverdi Pourfallah, Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran. Fax: +98 21 88973653 E-mail: [email protected] Background: Polymer gel dosimetry is still the only dosimetry method for direct measuring of threedimensional dose distributions. MRI Polymer gel dosimeters are tissue equi...

During in reactor operations, the slowing down of fission fragments generates most radiation damage uranium dioxide. Fission deposit their energy to both atomic and electronic subsystems through nuclear interactions. To study possible synergistic effects deposition on microstructure, UO2 thin foils have been irradiated with 0.39 MeV Xe and/or 6 Si ions at 298 K using single or dual beam ion irr...

I N CONSIDERING the radiobiological effects of ionizing radiations, there is one area of investigation which is of considerable interest, but as yet relatively little studied, i.e., the tissue effect. In contrast to the direct cellular effect, which has been extensively studied, how do xrays and irradiation with heavy ions affect highly organized tissues? Also, how does irradiation beam size al...

Knowledge of fuel limits and safety margins in normal and off-normal transients in nuclear power plants remains a constant preoccupation for electricity producers and fuel manufacturers. Accurate determination of such limits, through fuel irradiation testing in the OSIRIS reactor at Saclay is closely linked to the reliability of appropriate instrumentation techniques. Two paths are currently fo...

A number of studies have suggested that the irradiation behavior and damage processes occurring during sequential and simultaneous particle irradiations can significantly differ. Currently, there is no definite answer as to why and when such differences are seen. Additionally, the conventional multi-particle irradiation facilities cannot correctly reproduce the complex irradiation scenarios exp...