Investigation of radon concentrations of underground metro and Marmaray stations in Istanbul

In this study, radon (Rn) measurements were evaluated for the first time in the underground metro and Marmaray stations in Istanbul and the annual effective dose values were calculated to the employees and for passengers. Radon concentrations ranged from 39.47 to 382.02 Bq m(-3) for the railway platforms. The average radon value for all station platforms found to be 114.60 Bq m(-3). The annual effective dose values for the employees working at the platforms varied from 0.12 and 2.75 mSv y(-1), while the data for the passengers were varied from 0.035 and 0.34 mSv y(-1)

THE RARE Z-]J/PSI(UPSILON)+X DECAYS IN SU(2)XU(1)XU(1) GAUGE-THEORIES

In the framework of the SU(2) x U(1) x U(1) gauge model the rare decays Z --> J/psi(gamma) + X (where X is the light gauge boson corresponding to the extra U(1) group) are investigated. Using the model of independent restrictions to the coupling constant and mass of X-boson, it is shown that, in some region of parameters, these decay rates (greater-than-or-equal-to 10 keV) can be measurable in LEP with high luminosity

Octupole correlations in high-K states in Pu-240

The aim was to search for reflection asymmetric high-K states in Pu-240 by measuring coincidences across the T-1/2 = 165 ns, K-pi = 5(-) two-quasiproton isomer. The measurements were undertaken with the AFRODITE gamma-ray spectrometer when a pulsed beam of 30MeV alpha particles was directed onto a U-238 target. No evidence was found for the known gamma rays that decay from the isomer into the ground state band

TAC Proton Accelerator Facility: The Status and Road Map

Proton Accelerator (PA) Project is at a stage of development, working towards a Technical Design Report under the roof of a larger-scale Turkish Accelerator Center (TAC) Project. The project is supported by the Turkish State Planning Organization. The PA facility will be constructed in a series of stages including a 3 MeV test stand, a 55 MeV linac which can be extended to 100+ MeV, and then a full 1-3 GeV proton synchrotron or superconducting linac. In this article, science applications, overview, and current status of the PA Project will be given

Virtual electron energies dosimetry of a medical linear accelerator

OBJECTIVE

Towards a better understanding of detection properties of different types of plastic scintillator crystals using physical detector and MCNPX code

The purpose of this comprehensive research is to observe the impact of scintillator crystal type on entire detection process. For this aim, MCNPX (version 2.6.0) is used for designing of a physical plastic scintillation detector available in our laboratory. The modelled detector structure is validated using previous studies in the literature. Next, different types of plastic scintillation crystals were assessed in the same geometry. Several fundamental detector properties are determined for six different plastic scintillation crystals. Additionally, the deposited energy quantities were computed using the MCNPX code. Although six scintillation crystals have comparable compositions, the findings clearly indicate that the crystal composed of PVT 80% + PPO 20% has superior counting and detecting characteristics when compared to the other crystals investigated. Moreover, it is observed that the highest deposited energy amount, which is a result of the highest collision number in the crystal volume, corresponds to a PVT 80% + PPO 20% crystal. Despite the fact that plastic detector crystals have similar chemical structures, this study found that performing advanced Monte Carlo simulations on the detection discrepancies within the structures can aid in the development of the most effective spectroscopy procedures by ensuring maximum efficiency prior to and during use