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  • Author or Editor: S. Ambe x
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Abstract  

Mössbauer emission spectra of defect119Sn atoms arising from119Sb were measured in InSb, GaSb, CdSb, ZnSb, In2Te3, CdTe, and Ag2Te labeled with119Sb or its parent119mTe. Together with the results of our previous studies, the isomer shifts of defect and normal119Sn were shown to correlate with the electronegativity of ligands from silver to iodine.

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Abstract  

Adsorption behaviour of trace elements, In(III), Sn(IV), Sb(V) and Te(IV) on activated carbon and graphite powder was studied. Adsorption characteristics of the ions enabled the separation of In(III)–Sn(IV), Sn(IV)–Sb(V) and Sb(V)–Te(IV) pairs. Applications to practical separation, milking of113mIn from113Sn, removal of tin impurity from119Sb, and milking of119Sb from119mTe, are presented.

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Abstract  

Iron foil was irradiated with an 80 MeV/nucleon16O-ion beam. The foil was dissolved in hydrochloric acid, and Fe2+ in the solution was oxidized to Fe3+ with hydrogen peroxide. The solution was diluted to 6M in HCl and was passed through an anion exchange column. Washing with 6M HCl yielded a carrier- and salt-free multitracer solution covering radioactive nuclides of elements from sodium to manganese.

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Abstract  

The permeation of various elements through a tributyl phosphate (TBP)-decalin membrane supported on a microporous polytetrafluoroethylene sheet was studied using a multitracer. Permeation rates of elements from feed solutions to distilled water as a receiving agent were determined by changing the HCl concentration in feed solutions. An increase in the transport was observed for most of the elements studied with increasing HCl concentration in the feed solutions. Among them, Fe, Zn, Se, Zr, Nb, Te, Hf and Re gave relatively high percentages of permeation from 4-12 mol.dm-3 HCl feed solutions. The permeability coefficients of these elements were determined.

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Abstract  

Radioisotopes of 37 elements were isolated from a gold target irradiated with an energetic12C beam and were used as a multitracer to establish procedures for separating themselves into groups of carrier-, salt-and organic matter-free tracers. Solvent extraction with HDEHP and ethyl methyl ketone along with cation exchange yielded group tracers ready for application to chemical and biological studies.

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Abstract  

Labeling of antibodies, immunoglobulin G (IgG), with a multitracer was investigated with the aim of its utilization in the preparation of radiopharmaceuticals. The labeling procedure consists of two steps: conjugation of diethylenetriaminepentaacetic acid (DTPA) cyclic dianhydride with IgG and subsequent labeling with the multitracer.

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Abstract  

pH dependence of the adsorption of Na, Sc, Ga, As, Se, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, and Pd on -Fe2O3 from a 0.1 mol dm–3 NaCl solution was studied by using a multitracer technique. Desorption of the metal ions from the -Fe2O3 with the adsorbed metal ions at pH 11 was also studied by lowering the pH of the suspensions. The desorption curve of each element was in good agreement with the adsorption curve except for Ru and Rh under conditions studied. Adsorption kinetics showed that the adsorption of most metal ions increases with shaking time before an adsorption equilibrium is attained. An increase in the adsorption was also observed with an elevation in temperature for the elements, suggesting that the adsorption is involved in chemisorption.

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Abstract  

Using a radioactive multitracer and model acid rain (HCl or H2SO4 solution), batch experiments were performed to examine the pH effect on the adsorption-desorption equilibrium of 16 elements on soils as a model study of an acid rain effect. Kaolin, black soil (original and with organic matter almost removed) and Kureha soil (original and with organic matter almost removed) were used as adsorbents. Characteristic dependence on the pH value of the suspension was observed for the adsorption of the elements on kaolin and the soils. The results of this model study indicate that acid rain decreases the retention of cations, while it increases or does not change the adsorption of anions on soils. Organic matter in soils has a positive effect on the extent of adsorption of most elements investigated.

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Abstract  

The uptake rate of95mTc,83Rb, and65Zn by soybean plants cultivated in soil was measured during 2≈247 hrs by a multitracer technique. The uptake amount in most of the leaves and stems increased up to 150≈200 hrs after the administration of the multitracer and then decreased with time. The uptake amount of65Zn in the youngest fruit increased until 120 hrs and then decreased with time, and83Rb uptake reached almost a constant amount after 120 hrs. On the other hand, the uptake amount of95mTc in the youngest fruit increased continuously up to 247 hrs. The behavior of elements in the leaves and stems was analyzed mathematically with the second order function,A r=c+k1t+k2t2, 0<t=247, whereA is the amount of uptake or translocation of elementr in each part of plants,c is a constant,t is cultivating time after the multitracer has been added,k 1 andk 2 are coefficient oft andt 2, respectively.

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Abstract  

The uptake and the distribution of radioactive trace elements in Se-deficient rats were examined by the multitracer technique, which can be used to evaluate the behavior of many elements under the same experimental conditions. The uptake of Se was larger in the brain, spleen, and testicles of the Se-deficient rats than in those of the normal ones. The uptake of As, Fe, and Sc was larger in the liver of Se-deficient rats than in that of normal ones. In the bone, the uptake of Zr of Se-deficient rats was larger than that of normal ones. Selenium is known to be in a competitive or synergetic relationship with several metals. From the present results on Sc and Zr, it was newly cleared up that there is also some interaction between those elements and Se.

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