Isotope dilution mass spectrometry (IDMS) is used extensively at NBS in the certification of elemental concentrations in Standard Reference Materials. It is regarded at NBS as a "definitive method," that is, a method of proven high accuracy. Since the theme of this symposium is accuracy in trace element analysis, it is appropriate to review the role IDMS plays in accurate inorganic analysis. Th...

Background and Purpose—The treatment of large brain arteriovenous malformations (BAVMs) is challenging, and embolization alone is seldom curative. The study goal is to enhance the efficacy of arteriovenous malformation embolization by adding a -emitting isotope to the embolic agent. Methods—The pig rete mirabile was used as a BAVM model. The body distribution of radioactivity was evaluated afte...

Ljubljansko polje and Ljubljansko Barje aquifers are the main groundwater resources for the needs of Ljubljana, the capital of Slovenia. Carbonate chemistry and isotope analysis of the groundwater were performed to acquire new hydrogeological data, which should serve as a base for improvement of hydrogeological conceptual models of both aquifers. A total of 138 groundwater samples were collecte...

Ions with similar charge-to-mass ratios cannot be separated from existing beam profile monitors (BPMs) in nuclear facilities which low-energy radioactive ions are produced due to fusion reactions. In this study, we developed a BPM using microchannel plate and charge-coupled device differentiate the profiles of alpha-decaying isotopes other (reaction products) reaction. This was employed optimiz...

Kinetic experiments are of great importance in lipid research because they further the understanding of lipid metabolism in vivo and help to explain the physiopathology of lipid disorders in humans. At present, due to species specificity, no valid animal model can efficiently replace a study in humans to explore lipid metabolism, and the use of radioactive tracers is restricted in humans. Thus,...

2 2 Na and the stable isotope 2 3 Na. The accuracy of that experiment was, however, low, because the specif ic activity measurement was based on the assumption that the sodium nitrate was pure, while a certain contamination due to thermal decomposition, corros ion of the packing material, etc. could hardly be avoided. The purpose of the present work is to re-determine the mass effect by using t...

Isotope therapy is one of the methods used in primary hyperthyroidism. The therapy is based on short-range beta radiation emitted from radioactive iodine. Radioiodine administration must always be preceded by pharmacological normalization of thyroid function. Otherwise, post-radiation thyrocyte destruction and thyroid hormones release may lead to hyperthyroidism exacerbation. Indications for ra...

One of the methods for treating oncological diseases is application short-lived radionuclides. Existing risks intoxication and radioactive contamination can be eliminated by introduction a radon isotope into hard strong fullerene coat. To increase effectiveness these drugs it promising to introduce structural fragments amino acids, peptides, steroid hormones, nucleic bases or heterocyclic compo...

Tamusu area in Inner Mongolia is one of the favorable site candidates for high level radioactive waste (HLW) repository, which requires a stable regional tectonic environment. Field investigation, mossbauer spectroscopy, major elements, carbon and oxygen isotope quartz micro morphology fault gouge host rock three faults candidate were conducted. The results show that F2 F7 on north south sides ...