Background: Neutron contamination is produced in electron beams of linac when tooth or dental materials are located in the path of beam. Objective: This study aims to determine the neutron dose contamination from different dental restoration materials in electron mode of a linac. Material and Methods: In this experimental study, the neutron dose contamination was calculated in the p...

The following work is devoted to the description of atoms and ions in strong magnetic fields as they can occur in the vicinity of magnetic white dwarfs and neutron stars. The ultimate goal of this work is the contribution to an understanding of unique absorption features detected in the spectra of such stars. One natural explanation for these features are atomic absorptions in the stars’ strong...

The operation of a high energy particle accelerator facility is accompanied by neutron fields which are widely distributed in energy. As the neutron component dominates the dose outside the shielding neutron dose meters are needed for monitoring the radiation level at beam lines and experimental areas which can be accessed by personnel. For this purpose the so-called neutron rem-counter of the ...

1. Solute concentrations were measured in the frontal bodies and hypopharyngeal bladder surfaces, which form the absorption system of Arenivaga. Measured values were compared with the concentrations necessary to lower relative humidity to the absorption threshold, 81% R.H. 2. The predominant inorganic solutes, measured by instrumental neutron activation analysis, were Na, K, and Cl. Their conce...

We have developed a phenomenological quasi-deuteron model to describe photodisintegration reactions of He and He at intermediate photon energies, and compared the results with experimental data obtained by TAGX group in which contributions from photon absorption by pn pair were selectively observed. The data can be reproduced reasonably well, however there still remain certain discrepancies bet...

We use four Chandra gratings spectra of the neutron star low-mass X-ray binary 4U 1820 30 to better understand the nature of certain X-ray absorption lines inX-ray binaries, including theNe ii, Ne iii, Ne ix, O vii, andO viii lines. The equivalent widths of the lines are generally consistent between the observations, as expected if these lines originate in the hot interstellar medium. No eviden...

Absorptive corrections to the one pion exchange and measurability of the small-x pion structure function at HERA Abstract We compare the absorptive corrections to the one pion exchange in pp → Xn and ep → e ′ Xn reactions. It is shown that the absorption is stronger in the case of pp collision. The difference in strength of the absorption for the pp → Xn and ep → e ′ Xn reactions breaks the fac...

We present timing measurements, astrometry, and high-resolution spectra of a number of nearby, thermally emitting, isolated neutron stars. We use these to infer magnetic field strengths and distances, but also encounter a number of puzzles. We discuss three specific ones in detail: (i) For RX J0720.4−3125 and RX J1308.6+2127, the characteristic ages are in excess of 1 Myr, while their temperatu...