Measurement of surface alpha contamination using electret ion chambers

Area of Science:

• Radiation Detection and Measurement
• Nuclear Instrumentation
• Environmental Monitoring

Background:

• Electret ion chambers are passive, charge-integrating devices used for radiation measurement.
• Their low cost, light weight, and commercial availability make them attractive for various applications.
• Evaluating their performance for surface alpha contamination is crucial for safety and monitoring.

Purpose of the Study:

• To assess the performance of electret ion chambers for surface alpha contamination measurement.
• To identify optimal combinations of ion chambers and electrets for this application.
• To understand the influence of various parameters on measurement accuracy.

Main Methods:

• Utilized two types of ion chambers and three electret thicknesses.
• Calibrated devices using reference alpha standards with varying energies and radioactivities.
• Investigated effects of chamber dimensions, electret thickness, alpha energy, source position, and ambient radiation.

Main Results:

• Determined the impact of parameters like chamber geometry, electret properties, and alpha source characteristics on chamber response.
• Identified specific chamber and electret combinations suitable for surface alpha contamination assessment.
• Quantified the influence of Mylar window presence and background radiation levels.

Conclusions:

• Electret ion chambers can be effectively configured for accurate surface alpha contamination monitoring.
• Understanding parameter effects allows for optimization of measurement strategies.
• This research provides guidance for selecting appropriate electret ion chamber setups for alpha radiation detection.