mycoplasma and ureaplasma species are the most serious contaminants of cell cultures and this remains one of the major problem encountered in biological research using cell cultures. the aim of this study was to investigate the rate of mycoplasma and a total of 100 different cell culture specimens including, r228, hela, vero, mdck, l20, rd and hep2 were collected. then the specimens were invest...

objectives the aim of this study was to assess soils of khorramabad metropolis in order to establish the concentration of lead and develop a contamination factor map. materials and methods soil samples were collected from 25 different urban parks in khorramabad, iran. the mean pb contents in the urban topsoil samples were compared with mean concentrations for other cities around the world. a sp...

In the frame of a long-term research program on characterization large radioactive waste packages by photofission, Nuclear Measurement Laboratory CEA IRESNE, France, has measured cumulative photofission yields 235U and 238U short-lived long-lived fission products using Bremsstrahlung photon beam produced 16 MeV electron linear accelerator (LINAC). To this aim, been carried out activation analys...

The ground state half-lives of 69Ge, 73Se, 83Sr, 63Zn, and the half-life 1/2− isomer in 85Sr have been measured with high precision using photoactivation technique at an unconventional bremsstrahlung facility that features a repurposed medical electron linear accelerator. γ-ray activity was counted over about 6 high-purity germanium detector, enclosed into ultra low-background lead shield. are:...

Brass mesh bolus has been shown to be an acceptable substitute for tissue-equivalent bolus to increase superficial dose for chest wall tangent photon radiotherapy. This work investigated the increase in surface dose, the change in the dose at depth, and the safety implications of higher energy photon beams when using brass mesh bolus for postmastectomy chest wall radiotherapy. A photon tangent ...

This paper characterizes the functional dependence of the giant dipole resonance neutron yield produced by electrons in terms of the atomic number (Z) and thickness (T) of the target. The yields were calculated by integrating, over the photon energy, the product of the differential photon track length and published photoneutron cross sections. The EGS4 Monte Carlo code and analytical formulas w...

This study of doses to patients from emitted photoneutrons in a medical linear accelerator (Varian 2100C) was carried out. Dose calculation was performed using Monte Carlo Geant4 code. The model was used to calculate the neutron fluence, as a function of the neutron energy inside the treatment room to estimate the effective dose to patients. The ambient dose equivalent versus field size for pat...