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U.K. National Radiological Protection Board Radon Calibration Procedures.

¹National Radiological Protection Board, Chilton, Didcot, Oxon, OX11 ORQ, U.K.

Journal of Research of the National Institute of Standards and Technology

|February 10, 2017

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This study details a new method for calibrating instruments that detect radon-222 (²²²Rn) in air. The procedure uses alpha spectrometry to measure polonium-218 (²¹⁸Po) concentration, achieving accurate ²²²Rn measurements.

Area of Science:

Environmental Science
Analytical Chemistry
Radiological Health

Background:

Accurate detection of radon-222 (²²²Rn) is crucial for environmental monitoring and health risk assessment.
Existing calibration methods for ²²²Rn detection instruments require refinement for improved accuracy and reliability.

Purpose of the Study:

To describe a novel procedure for calibrating instruments designed to detect ²²²Rn in ambient air.
To establish a reliable method for determining ²²²Rn concentrations using alpha-spectrometric analysis.

Main Methods:

The calibration method relies on the alpha-spectrometric determination of polonium-218 (²¹⁸Po) concentration within a specialized calibration chamber.
The procedure involves maintaining a high aerosol concentration within the chamber to ensure accurate measurements.

Keywords:

aerosol generation alphaspectrometry calibration chamber radon daughter measurement radon gas measurement statistical uncertainty

Related Experiment Videos

Steady-state ²¹⁸Po concentrations are measured and related to the ²²²Rn concentration.

Main Results:

The concentration of ²¹⁸Po at steady state was found to be approximately 98% of the ²²²Rn concentration in the calibration chamber.
The developed method allows for the determination of ²²²Rn concentration with an overall uncertainty of about 7% at the 95% confidence level.

Conclusions:

The described alpha-spectrometric method provides a validated and accurate procedure for calibrating ²²²Rn detection instruments.
This method enhances the reliability of environmental radon monitoring, contributing to better public health protection.
The assessed uncertainty of 7% demonstrates the robustness of the calibration technique.