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PIXE Analysis for Drainage from a Radioisotope Laboratory

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Aramaki-Aza-Aoba 01, Sendai 980-8579, Japan

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H. YAMAZAKI

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Aramaki-Aza-Aoba 01, Sendai 980-8579, Japan

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K. ISHII

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Aramaki-Aza-Aoba 01, Sendai 980-8579, Japan

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S. MATSUYAMA

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Aramaki-Aza-Aoba 01, Sendai 980-8579, Japan

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T. SATO

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Aramaki-Aza-Aoba 01, Sendai 980-8579, Japan

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H. ORIHARA

Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan

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, and

G. C. JON

Institute of Physics, Academia Sinica, Nankang Taipei, Taiwan 11592, ROC

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https://doi.org/10.1142/S0129083598000078Cited by:1 (Source: Crossref)

Abstract

PIXE technique has been applied to quantitative analysis of thorium and uranium ions in drainage from a radioisotope laboratory of Tohoku University. Two kinds of targets were prepared and analyzed with an in-air vertical PIXE system of 3 MeV protons. The concentrations of thorium and uranium higher than 40 ppb were easily determined by 3-μC irradiation on targets which are made from a 0.12-ml solution containing Ga-internal standard evaporated on a hand-made polycarbonate film. Uranium(VI) ions in a 25-ml sample were preconcentrated into a thin uniform target containing Zr or Pd as an internal standard by means of dibenzyldithiocarbamate complexation with subsequent condensation into dibenzylidene-D-sorbitol gels, and low concentration of 10 ppb was precisely determined by PIXE measurement. This method does not work for concentrating thorium ions. The PIXE analysis for these two kinds of targets has good sensitivity and precision enough to determine concentrations of thorium and uranium lower than their permissible concentration limits in drainage from a radioisotope laboratory.

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