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ESTABLISHMENT OF A LOW DOSE RATE GAMMA RAY CALIBRATION FIELD FOR ENVIRONMENTAL RADIATION MONITORING DEVICES.

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  • 1Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Naka, Ibaraki, Japan.

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Summary
This summary is machine-generated.

A new cesium-137 gamma ray calibration field was established for environmental radiation monitoring dosemeters. This field provides accurate low dose rates, crucial for calibrating monitoring devices and assessing radiation levels.

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Area of Science:

  • Radiation Physics
  • Metrology
  • Environmental Science

Background:

  • Accurate calibration of dosemeters is essential for reliable environmental radiation monitoring.
  • Existing calibration fields may not fully meet international standards like ISO 4037.
  • Low dose rate calibration fields are needed for routine dosemeter checks.

Purpose of the Study:

  • To establish a low dose rate 137Cs gamma ray calibration field meeting ISO 4037 requirements.
  • To accurately determine the reference air kerma rate for the established field.
  • To validate the suitability of the field for calibrating environmental radiation monitoring devices.

Main Methods:

  • Established a 137Cs gamma ray calibration field at the Japan Atomic Energy Agency's Facility of Radiation Standards.
  • Determined reference air kerma rate using a conventional ionization chamber and a G(E) function method with a scintillation spectrometer.
  • Utilized a lead collimator to minimize gamma ray scattering within the irradiation room.

Main Results:

  • The established calibration field satisfies ISO 4037 requirements for low dose rate measurements.
  • Gamma ray scattering from room structures was found to be negligible.
  • The field provides ambient dose equivalent rates ranging from 0.7 to 7.2 μSv h-1.
  • A NaI(Tl) scintillation survey meter was successfully calibrated with satisfactory results.

Conclusions:

  • The new 137Cs calibration field is suitable for routine calibration of environmental radiation monitoring dosemeters.
  • The field's accuracy allows for reliable monitoring of affected areas and assessment of decontamination progress.
  • The established field supports accurate environmental radiation measurements and compliance with international standards.