Abstract Isotopic ratios of radioactive xenons sampled in the subsurface and atmosphere can be used to detect underground nuclear explosions (UNEs) civilian reactors. Disparities half-lives decay chains are principally responsible for time-dependent concentrations xenon isotopes. Contrasting timescales, combined with modern detection capabilities, make isotopic family a desirable surrogate UNE ...

At present work, under initial inventory with Th and U, the evolution of nuclides in subcritical devices under given thermal, fast, hardening fast and fission neutron field are studied without the detail structure of sub-critical device and the burn-up being considered. It is supposed that the subcritical reactor consists of uniform in which the flux of neutron is homogeneous. The fissile nucli...

The arriving abundances of a variety of cosmic-ray nuclides consist of comparable amounts of primary material produced by stellar nucleosynthesis and secondary matter resulting from fragmentation of heavier nuclei by collisions during interstellar propagation. We discuss a technique for extracting the primary and secondary contributions that takes advantage of energy spectra of individual nucli...

Introduction: The origin of short-lived nuclides in the solar nebula is a long standing controversial issue. There are two major explanations: injection from neighboring supernovae or AGB stars [1-3], or in situ irradiation of nebular dust and gas by solar energetic particles (SEP) [4-7]. The distribution of short-lived nuclides in the solar nebula is a key test of these models. Unlike

This report presents the methods and calculated results of activity inventory in structural components Dalat Nuclear Research Reactor (DNRR). These include shielding concrete, reactor tank, its inside irradiated facilities; thermal thermalizing columns; horizontal channels. The MCNP5 code with a three-dimensional neutron transport model was used to calculate flux distribution, energy spectrum a...

Evaluation of nuclear data for JENDL Actinide File and High Energy Files is now in progress. JENDL Actinide File will contain evaluated nuclear data for 89 nuclides horn 2 0 8= to ‘5Fm including main fissile and fertile nuclides. The data are evaluated in the neutron energy region from 10‘5 eV to 20 MeV, by widely using theoretical calculations and systematic of parameters and cross sections. E...

South coast of India is known as the high-level background radiation area (HBRA) mainly due to beach sands that contain natural radionuclides as components of the mineral monazite. The rich deposit of monazite is unevenly distributed along the coastal belt of Tamil Nadu and Kerala. An HBRA site that laid in 2×7 m along the sea was found in the beach of Chinnavillai, Tamil Nadu, where the maximu...