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Low level 137Cs measurements in deep seawater samples

Aoyama1, Hirose, Miyao

  • 1Meteorological Research Institute, Tsukuba, Japan. maoyama@mri-jma.go.jp

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 6, 2000
PubMed
Summary

Researchers improved the ammonium phosphomolybdate (AMP) method for measuring low-level cesium-137 (137Cs) in seawater. This optimized procedure enhances recovery and allows precise tracking of 137Cs in oceanographic studies.

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Area of Science:

  • Environmental Chemistry
  • Radiochemistry
  • Oceanography

Background:

  • Observed decrease in ammonium phosphomolybdate (AMP) recovery for low-level 137Cs measurements in deep seawater.
  • Need for a reliable method to quantify 137Cs in large-volume oceanic samples.

Purpose of the Study:

  • To investigate and improve the AMP procedure for accurate low-level 137Cs determination in seawater.
  • To establish an optimized method for 137Cs analysis suitable for oceanographic tracing.

Main Methods:

  • Adjusting pH to 1.6-2.0 and adding CsCl to form an insoluble compound with AMP.
  • Precipitating AMP/Cs compound from 20-100 L seawater samples, followed by recovery after 6-24 hours.
  • Utilizing a high-purity germanium (HPGe) coaxial well detector for 137Cs activity measurement.

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Main Results:

  • Achieved approximately 98% weight yield of AMP/Cs compound and 96-100% radiochemical 137Cs yield for 20 L samples.
  • Measured low 137Cs concentrations (<0.1 Bq m⁻³) in deep western North Pacific waters (1997-1998).
  • Demonstrated high absolute efficiency (16%) of the HPGe detector for 137Cs at 662 keV.

Conclusions:

  • The improved AMP procedure provides high recovery and accuracy for low-level 137Cs measurements in large seawater volumes.
  • This method enables high-resolution 137Cs profiling, valuable for using 137Cs as a transient tracer in oceanography.
  • The optimized technique is suitable for diverse oceanographic applications requiring precise 137Cs quantification.