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A performance evaluation of bare alpha track detectors
W M Yeager1, N F Rodman, S B White
1Research Triangle Institute, Research Triangle Park, NC 27709.
Health Physics
|February 1, 1994
Summary
Bare alpha track detectors measure both radon gas and its progeny. Their readings depend linearly on both concentrations and the assumed equilibrium factor, with minor altitude effects.
Area of Science:
- Environmental Science
- Radiological Health
- Nuclear Instrumentation
Background:
- Bare alpha track detectors are commonly used for radon monitoring.
- Radon progeny can significantly influence detector readings.
- Understanding detector response to both radon and its progeny is crucial for accurate environmental monitoring.
Purpose of the Study:
- To evaluate the response of bare alpha track detectors to varying radon gas and progeny concentrations.
- To determine the relationship between detector readings and actual radon/progeny levels.
- To assess the impact of the equilibrium factor and altitude on detector sensitivity.
Main Methods:
- Testing two brands of bare alpha track detectors.
- Exposing detectors to controlled radon gas concentrations.
- Exposing detectors to controlled radon progeny concentrations.
- Analyzing detector response as a function of radon and progeny levels.
Main Results:
- A linear relationship was observed between detector readings and a combination of radon gas and progeny concentrations.
- The reported radon concentration is significantly affected by the assumed equilibrium factor.
- Detector sensitivity shows a minor, correctable increase with altitude.
Conclusions:
- Bare alpha track detectors respond to both radon gas and progeny.
- Accurate radon concentration reporting requires careful consideration of the equilibrium factor.
- Altitude effects are secondary but should be accounted for in precise measurements.