Introduction: Neutron contamination is very harmful for the patients receiving radiation therapy due to the high relative biological effect of neutrons. Medical linear accelerators head are made up of materials with high atomic numbers, and High-energy photons interaction with heavy materials can produce neutron contamination. In this study, neutron equivalent dose, neutron spe...

Quasi-elastic neutron scattering (QENS) from bulk-water at 300 K, measured on the IRIS backscattering spectrometer (ISIS, UK), is interpreted using jump diffusion model (JDM), a “minimalistic” multi-timescale relaxation (MRM) and molecular dynamics simulations (MD). In case of MRM data analysis performed in time domain, where intermediate function described by stretched Mittag-Leffler function,...

The use of acoustic waves in researches related to sea water is of most importance among scientists recently. Since these waves are the only waves, transmitted in water with lowest attenuation and high speed, they can be used in many scientific fields. The main goal of this research is to better understand the physics and mechanisms of sound-seabed interaction, including acoustic penetration, p...

Introduction: Environmental and occupational human exposure from neutron source can lead to the serious biologic effects. The aim of this study is to evaluate the cancer incidence risk for various human organs at different neutron dose levels due to exposure from an Americium-241/Beryllium (Am-241/Be), a standard neutron source for calibration purposes. Material and Methods: We measured ambient...

Neutron sources employed in different applications in both medicine and industry. Due to the harmful effects of neutron particles on living organisms, radiation shields have played a vital role in radiation protection against neutrons. In recent decade, numerous investigations conducted on the design and fabrication of nanocomposites as more efficient shielding materials against fast and therma...

We present studies on electron backscattering from the surface of plastic scintillator beta detectors. By using a setup of two detectors coaxial with a strong external magnetic field – one detector serving as primary detector, the other as veto-detector to detect backscattering – we investigate amount and spectrum of unrecognized backscattering, i.e. events where only one detector recorded a tr...

background: a boron neutron capture therapy (bnct) facility, based on a dt neutron generator, with the final goal to find out a potential, alternative, solution to existing bnct treatment facilities which are based on nuclear reactors is examined. materials and methods: with the aim of the mcnp4b monte carlo code different beam-shaping assembly (bsa) configurations were considered. lead was sel...

in this research, cobalt and nickel sulfide nanoparticles (nps) were grown on almcm-41 matrix by using ion exchange method. the prepared samples were irradiated by thermalized neutron that emitted from am-be source up to fluencies (7.9+e9n/cm2). after that, x-ray diffraction (xrd), uv-vis spectroscopy, fourier transform infrared (ftir), scanning electron microscopy (sem) and transmission electr...

Ultrasonic attenuation and backscattering were measured for bovine brain, spleen and liver and for porcine iiver as a function of time after excision for times up to 12Ohr. Tine attenuation coeificient exhibits insigniticant chaoges while the mean backscattering amplitude decreases substantiahy during the period such specimens are likely to be used. The changes in the two parameters are believe...

The transmission behavior of a quantum point contact in a magnetic field is calculated, exhibiting in detail the influence of intersubband scattering. In contrast to the commonly known reduction of backscattering by a magnetic field, it is shown here that a weak field can cause increased backscattering. Nevertheless, the present results serve to illustrate that backscattering can occur without ...