PURPOSE Brachytherapy with radioactive high dose rate (HDR) (192)Ir source is applied to small skin cancer lesions, using surface applicators, i.e. Leipzig or Valencia type. New developments in the field of radiotherapy for skin cancer include electronic brachytherapy. This technique involves the placement of an HDR X-ray source close to the skin, therefore combining the benefits of brachythera...

Limited information is available on the molecular mechanisms by which long-term HIV-1-infected nonprogressors suppress HIV-1 infection and maintain immune functions. The intestinal mucosal immune system is an early target for HIV-1 infection and severe CD4+ T cell depletion. We evaluated mucosal T lymphocyte subsets, virus-specific cellular responses, gene expression profiles, and viral loads i...

During the recommissioning of a Philips RT-250 kilovoltage X-ray unit, unexpected output variations with tube head rotation (cross-plane) and tube head tilt (in-plane) were observed. The measured output showed an increase of up to 7.3% relative to the neutral position (0? in-plane and 0? cross-plane) over the possible range of angles of in-plane rotation for 75 kVp (half-value layer, HVL = 1.84...

Energy imparted is a measure of the total ionizing energy deposited in the patient during a radiologic examination and may be used to quantify the patient dose in diagnostic radiology. Values of the energy imparted per unit exposure-area product, omega (z), absorbed by a semi-infinite water phantom with a thickness z, were computed for x-ray spectra with peak x-ray tube voltages ranging from 50...

The aim of this research is to examine the radiation shielding properties 5B2O3-40SiO2-(55-x)Al2O3-xBaO (BSABa-x) glass systems, which are containing barium and aluminum oxide added borosilicate glasses, with varying from 25 34 weight fractions. Shielding parameters, such as linear attenuation coefficients (LAC), mass (MAC), mean free path (MFP), effective atomic number (Zeff), electron density...

abstract  introduction: recently uses of medium and high energy x-rays has been increased in iran and radiotherapy centers along with a variety of accelerators have been installed in some provinces. in the other hand there is no sufficient skill in designing and making radiotherapy treatment rooms. this study was conducted to evaluate the efficacy of different mixtures of barite concrete for sh...

Potassium lead borate glasses doped with MnO (40B2O3 + 40PbO (20-x)K2O xMnO: x = 0–5 mol%) have been prepared via standard melting quenching process. The impact of on the structure, optical, magnetic and gamma-ray protection properties pottisium examined. density was increased from 4.83to 5.23 g/cm3 as content while molar volume glass sample decreased 28.112 to 25.755 cm3/mol. obtained direct o...

background: this study aimed to determine the seroprevalence of canine visceral leishmaniasis in meshkin-shahr district as endemic areas of human visceral leishmaniasis (hvl) for presenting control program of hvl to health authorities.  methods: a seroepidemiological study to determine seroprevalence of canine visceral leishmaniasis (cvl) among owner­ship dogs using direct agglutination tests (...