The experimental studies on the cosmic-ray neutron energy spectrum and the neutron dose rate were performed in the Mt.Fuji area (altitude: 40m – 2400m) by using a Multi-sphere neutron Spectrometer (Bonner Sphere: BS) with the 5.07-cm diam. spherical He-3 proportional counter to assess the natural background neutron dose rate in Japan with good accuracy. The spectra measured at each altitude wer...

Over the past forty years, many efforts have been devoted to study low power laser light interactions with biological systems. Some of the investigations were performed in-vitro, on bulk cell populations. Our present work was undertaken to apply specially engineered fiber-optic based nano-probes for the precise delivery of laser light on to a single cell and to observe production of low power l...

It has been found that ion implantation can induce a swelling (step-height) phenomenon on crystal surface. In this paper, we studied about the control of swelling height of Si crystal by irradiating Ar beam under various parameters (fluence, charge and energy). These irradiation parameters were regulated by an irradiation facility that enables to achieve the multiple ionization. For both charge...

Red light treatment of dark-grown 6-day-old barley seedlings (Hordeum vulgare L.) strongly reduces the lag in chlorophyll accumulation in subsequent white light over that found in dark control seedlings placed under white light. Fluence-response studies show that the effect has both very low fluence and low fluence components. Kinetic studies indicate that the reduction in lag begins immediatel...

*Corresponding author: Dr. Asghar Mesbahi, Medical physics department, Medical school, Tabriz university of Medical Sciences, Tabriz, Iran. Fax: +98 411 3364660 E-mail: [email protected] Background: The characteristics of secondary neutrons in a high energy radiation therapy room were studied using the MCNPX Monte Carlo (MC) code. Materials and Methods: Two MC models including a model with...

Undoped self-assembled GaN quantum dots (QD) stacked in superlattices (SL) with AlN spacer layers were submitted to thermal annealing treatments. Changes in the balance between the quantum confinement, strain state of the stacked heterostructures and quantum confined Stark effect lead to the observation of GaN QD excitonic recombination above and below the bulk GaN bandgap. In Eu-implanted SL s...

The goal of this work is to assess Ta as a potential plasma-facing material for future fusion reactors in terms of its response to high-flux, low-energy He+ ion irradiation. Ta samples were irradiated with 100 eV He+ ions at various fluences up to 3.5 × 1025 ions m-2 while simultaneously heated at constant temperatures in the range 823-1223 K. SEM studies show that irradiated Ta surfaces underg...

Power devices are widely used for the power handling portion of the electronic devices for space systems as well as ground-based commercial devices. In our previous study, we investigated the fatal destruction mode called single-event effects (SEEs) in the SiC schottky barrier diode (SiC-SBD) and SiC metal-oxide-semiconductor field-effect transistor (SiC-MOSFET). SiC is expected to be a candida...