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  • Author or Editor: Z. Alfassi x
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Abstract  

It is suggested that Am3+ is forming different complexes with humic acids. At pH 4–5 at low concentration of Am3+ the complex is water soluble, while at higher concentration of Am3+ an insoluble complex is formed.

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Abstract  

The preparation of high specific activity128I by neutron activation of KIO3 is described. The128I produced in a Szilard-Chalmers process is eluted with a water-isopropylamine mixture which dissolves only KI but not KIO3.

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Abstract  

Different modes of epithermal neutron activation analysis are described. The principles and examples are given for each.

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Abstract  

The use of5 5Co for positron emission tomography (PET) is criticized on the grounds that its 477 keV -rays would interfere with the positron annihilation measurements. This interference will lead to distorded pictures, lower resolution and lower tumor-non tumor ratios for5 5Co-bleomycin. It is suggested that5 7Co-bleomycin used in single photon imaging is better replaced by5 7Ni-bleomycin rather than by5 5Co-bleomycin for PET studies.

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Abstract  

A method for the absolute calibrations of -rays spectrometers for voluminous samples using natural radionuclides is suggested. The method is based on relative calibration with a solution of 232Th salts and absolute calibration with K2CO3 or KCl.

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Abstract  

It was found that some trivalent cations form precipitates with humic acid at pH 4.2. The precipitates contain less metal cations than suggested by the neutralization-charge model for soluble complexes based on the available anionic sites. It is suggested that cations, which can form inner-sphere complexes, may precipitate before they are completely neutralized, while those that do not form complexes precipitate only after complete neutralization.

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