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Assay of 222Rn in water samples by a modified integral counting method
Y Murase1, Y Homma, I Murakami
1Laboratory for Radiopharmaceutical Chemistry, Kyoritsu College of Pharmacy, Tokyo, Japan.
Summary
Radon-222 activity in Tokyo
Area of Science:
- Environmental Science
- Radiochemistry
- Public Health
Background:
- Radon-222 (Rn) is a naturally occurring radioactive gas.
- Elevated radon levels in drinking water pose health risks.
- Monitoring radon in water is crucial for public safety.
Purpose of the Study:
- To measure radon-222 activity concentrations in private wells and springs in Tokyo.
- To evaluate the accuracy and uncertainty of the modified integral counting method for radon measurement.
- To compare this method with a direct liquid scintillation cocktail agitation method.
Main Methods:
- Collected water samples from 163 private wells and 14 springs in Tokyo.
- Measured radon-222 (Rn) activity concentrations using a liquid scintillation spectrometer.
- Employed a modified integral counting method for enhanced accuracy.
Main Results:
- Radon-222 activity concentrations ranged from 0.2 to 22.9 Bq/L, averaging 4.8 Bq/L.
- Evaluated and discussed sources of error, including air luminescence and interference from other radon isotopes (Rn, Rn).
- Demonstrated that radon-222 samples of 0.2 Bq/L can be assayed with an overall uncertainty of 3.1%.
Conclusions:
- The modified integral counting method provides accurate radon-222 measurements in water.
- The method is suitable for monitoring radon levels in Tokyo's water sources.
- Ensures reliable assessment of potential health risks associated with radon exposure.