نتایج جستجو برای: radioactive nuclides
تعداد نتایج: 21877 فیلتر نتایج به سال:
Abundance of live 244Pu in deep-sea reservoirs on Earth points to rarity of actinide nucleosynthesis
Half of the heavy elements including all actinides are produced in r-process nucleosynthesis, whose sites and history remain a mystery. If continuously produced, the Interstellar Medium is expected to build-up a quasi-steady state of abundances of short-lived nuclides (with half-lives ≤100 My), including actinides produced in r-process nucleosynthesis. Their existence in today's interstellar me...
The CSPD-1 y-ray vision system has been constructed for the energy range from 100 keV up to a few MeV, which encompasses most energies of y-ray radiation from the radioactive nuclides of interest t o nuclear facilities. The angular resolution of the system can be varied from about 7" down to 3" FWHM. The energy resolution at 662 keV is 6.8% or 8.9% FWHM depending on which of the two detectors a...
All building materials contain various amounts of natural radioactive nuclides. Materials derived from rock and soil contain mainly natural radionuclides of the uranium (238U) and thorium (232Th) series, and the radioactive isotope of potassium (40K). Radiation exposure due to building materials can be divided into external and internal exposure. The external exposure is caused by direct gamma ...
Abstract Decay properties known in neutral atoms can be altered significantly if all or most bound electrons are removed. Straightforwardly, fully-ionised nuclei, the decay channels involving simply disabled. Also modes, that hindered completely blocked atoms, may, respectively, become dominant open up highly charged ions. Few-electron ions by themselves clean systems with well-defined quantum ...
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