GEANT4 based Monte Carlo sim u la tions have been car ried out for the de ter mi na tion of ef fi ciency and con ver sion fac tors of a gas-flow ion iza tion cham ber for beta par ti cles emit ted by 86 dif fer ent ra dio iso topes cov er ing the av er age-b en ergy range of 5.69 keV-2.061 MeV. Good agree ments were found be tween the GEANT4 pre dicted val ues and cor re spond ing ex per i men ...

The Monte Carlo program ARROW, based on GEANT and using GHEISHA at energies below 30 GeV, is developed for simulation of the hadron and muon components of extensive air showers with primary energy 10 − 10 eV. Calculations of the characteristics of multi-muon events as observed underground by the LEP detectors are presented and their dependence on the primary cosmic ray composition and some basi...

SEQUIN investigates methods for providing QoS differentiated services over the IP-based networks such as the GÉANT network. Initially, the project defined a framework for supporting IP Premium service and described the procedures for establishing Service Level Agreements (SLAs) amongst networks such as GÉANT and the NRENs. In succession, SEQUIN investigates methods for monitoring the network be...

GEM detectors (Gaseous Electron Multiplier) are a type of MPD (micro pattern detector) that introduce a new standard in spatial resolution. They offer fast tracking because of the absence of an ion-tail, and the flexibility of a wide range readouts since the detection stage and amplification stages are completely separate. This makes GEM detectors suitable for many different types of experiment...

The response of the Ge detector array Gammasphere to y-rays, both individually and in cascades, has been modeled with the Monte Carlo code GEANT 3. The effects on the performance of Gammasphere of including an auxiliary detector, the Microball, are investigated. The use of the existing Ge detectors and BGO suppression detectors as a y-ray multiplicity and total y-ray energy spectrometer is expl...

On the level of this article, we deal with nuclear radiation (and their residues), which is defined as a physical phenomenon and strong atomic activity that occurs in unstable atoms elements. We are interested studying emission or diffusion energy into space form electromagnetic waves particles. The scientist Fermi (1934 AD) among first to present scientific research field. Radioisotopes consid...

In this paper we report a feasibility study of the gamma ray transmission imaging using a double gap resistive plate chamber. The detector consists of two layers of 2 mm resistive plate chamber (RPC) gaps with two-dimensional read-out strips of 10 mm pitch. Gamma ray transmission images for objects inside a cabinet, using a 10 mCi 137 Cs isotope, were obtained with a pixel resolution of 5 Â 5 m...

This is a summary of our assesment of QoS capabilities of the JuniperM10 router. We performed this assesment as a part of our QoS in IP project. This is not a scientific test, just our practical view based on our experience with QoS-related topics. We are gathering information about current possibilities of network QoS implementations available with various equipment and technologies. We are pr...

We propose a methodology to match detailed BGP updates from two neighboring Autonomous Systems (ASes). This methodology allows us to characterize route propagation and measure the route propagation time. We apply this methodology to two months of all BGP updates from Abilene and GEANT to perform the first thorough characterization of BGP route propagation between two neighbor ASes. Our results ...