نتایج جستجو برای: americium
تعداد نتایج: 384 فیلتر نتایج به سال:
INTRODUCTION The most difficult radionuclides to measure accurately by external chest counting are the isotopes of plutonium. They are detected through weak emission of low energy L X-rays; in the case of Pu, 11-20 keV L X-rays are emitted with the total emission rate of 0.042 per disintegration. These photons are severely attenuated by overlying tissue; typically about 0.1 % of the photons, th...
Radiotracer experiments using the photon-emitters 2 3 7 ~ and 2 4 1 ~ m were performed to examine uptake, tissue distribution and retention of plutonium and americium in the cephalopod Octopus vulgaris Cuvier. A 2 wk exposure in contaminated sea water resulted in twice as much 2 3 7 P ~ being taken up by whole octopus as 2 4 1 ~ m . Immediately following uptake approximately 41 % and 73 % of th...
This paper presents a physical random number generator for mainly cryptographical applications based on alpha decay of Americium 241. A simple and low-cost implementation is shown to detect the decay events of a radioactive source often found in common household smoke detectors. Three different algorithms for the extraction of random bits from the exponentially distributed impulses are discusse...
The capacity of mycorrhizal and non-mycorrhizal root systems to reduce nitrate (NO₃⁻) and ammonium (NH₄⁺) loss from soils via leaching was investigated in a microcosm-based study. A mycorrhiza defective tomato mutant and its mycorrhizal wildtype progenitor were used in this experiment in order to avoid the indirect effects of establishing non-mycorrhizal control treatments on soil nitrogen cycl...
The accurate knowledge of neutron cross-sections of a variety of plutonium isotopes and other minor actinides, such as neptunium, americium and curium, is crucial for feasibility and performance studies of advanced nuclear systems (Generation-IV reactors, Accelerator Driven Systems). In this context, the 240Pu(n,f) cross-section was measured with the time-of-flight technique at the CERN n_TOF f...
The European Commission is partly supporting research work on partitioning and transmutation of radioactive waste under the Fourth Framework Programme (1994-1998). This work includes nine research projects. Five strategy studies are evaluating the capabilities of various burners and fuel cycles to limit the production and even destroy the stock of actinides (plutonium and minor actinides). Two ...
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