background: changes in body composition may be used for monitoring progression/ regression of a disease. prompt γ-rays in vivo neutron activation analysis (ivnaa) has been widely used for the measurement of body composition in recent years. objective: in this paper, we tried to improve the safety of ivnaa operator. methods: the most important factor for reducing the operator receiving dose is t...

Tin oxide films were implanted with N at various energies between 5 to 40 keV for different ion doses between 10 to 10 cm. The microstructure, optical and electrical properties of the films were investigated. From Transmission Electron Microscopy the implanted films were shown to be amorphous. The implanted thickness for the 10 keV and 40 keV were found to be 30 nm and 110 nm, respectively. The...

Irradiation effects of γ-radiation on the physical and electrical properties of polycarbonate (Makrofol-E) film has been studied to be able to investigate the dielectric response of irradiated polymers for a wide range of fluence and frequency. The dielectric constant (έ)The loss tangent ( tanδ ), dielectric loss factor (ε ̋), the a.c electrical conductivity (σ) and the relaxation time (τ), were...

background: pet/ct imaging using [18f]-fdg is utilized in clinical oncology for tumor detecting, staging and responding to therapy procedures. essential consideration must be taken for radiation staff due to high gamma radiation in pet/ct and cyclotron center. the aim of this study was to assess the staff exposure regarding whole body and organ dose and to evaluate environment dose in pet/ct an...

background: we have validated the monitor unit calculations from a commercially available treatment planning system (tps) for three intensity modulated radiotherapy (imrt) planning techniques for tangential breast irradiation by using ionization chamber measurements. materials and methods: treatment plans were generated for forty-two breast patients by a forward planned field in field technique...

Objective(s) This study was carried out in order to evaluate the effects of electrochemotherapy, electrical pulses and chemotherapeutic drugs on the killing of cancerous cells and their probable synergistic effects. Materials and Methods Electrochemotherapy treatments conducted on MCF-7 cell line derived from human breast adenocarcinoma tumor using four chemotherapeutic drugs including bleom...

Descending inhibitory and facilitatory influences from the rostroventral medulla (RVM) on responses of lumbosacral spinal neurons to noxious colorectal distension (CRD, 80 mmHg, 20 s) were studied. At 25 sites in the RVM, electrical stimulation produced biphasic effects, facilitating responses of spinal neurons to CRD at lesser intensities of stimulation (5-25 microA) and inhibiting responses o...