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Calibration of a 220Rn flow-through source.

S Qiu1

  • 1School of Nuclear Science and Technology, Nanhua University, No. 28 Chang Sheng Road, Hengyang, Hunan, 421001, China, qiu-shoukang@tom.com.

Radiation and Environmental Biophysics
|August 11, 2006
PubMed
Summary

Two reference methods were developed to calibrate a self-made 220Rn flow-through source. This stable radon-220 (220Rn) source enables accurate calibration of radon monitors.

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Area of Science:

  • Radiochemistry
  • Metrology
  • Environmental Science

Background:

  • Accurate calibration of radon monitors is crucial for radiation safety and environmental monitoring.
  • Existing methods for calibrating radon sources can be complex and may require specialized equipment.
  • Development of a stable and reliable radon-220 (220Rn) flow-through source is needed for precise instrument calibration.

Purpose of the Study:

  • To establish and validate reference methods for calibrating a self-made 220Rn flow-through source.
  • To assess the stability and reliability of the developed 220Rn source under varying environmental conditions.
  • To enable accurate calibration of radon monitors using the characterized 220Rn source.

Main Methods:

  • Development of two reference methods: a scintillation cell flow-through method and a gamma spectrometry method using activated charcoal.
  • Theoretical and experimental validation of the calibration methods, including intercomparison measurements.
  • Assessment of source stability over five years, considering relative humidity (50-90%) and temperature (5-38°C).

Main Results:

  • The self-made 220Rn flow-through source demonstrated high stability, with a relative deviation less than 2.5% over five years.
  • The calibration methods were validated, confirming their accuracy and reliability.
  • The 220Rn monitor used in the reference methods was calibrated without a pre-existing 220Rn gas source of known yield.

Conclusions:

  • The established reference methods provide a reliable means to calibrate the yield of a self-made 220Rn flow-through source.
  • The characterized 220Rn source exhibits excellent long-term stability under diverse environmental conditions.
  • Accurate calibration of any 220Rn monitor is feasible using this self-made, stable 220Rn source.

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