Dynamic Radioactive Source for Evaluating and Demonstrating Time-dependent Performance of Continuous Air Monitors

Area of Science:

• Nuclear Engineering
• Environmental Monitoring
• Radiation Detection

Background:

• Continuous air monitors (CAMs) are crucial for detecting airborne radioactive particulates.
• Traditional testing with plutonium aerosols is costly, time-consuming, and requires specialized facilities.
• Existing methods lack the flexibility for real-time, adaptable challenge testing.

Purpose of the Study:

• To develop and evaluate a Dynamic Radioactive Source (DRS) as a safer, more efficient alternative to plutonium aerosol testing for CAMs.
• To enable in-house, benchtop testing of CAMs with realistic temporal release simulations.
• To facilitate the iterative development and validation of CAM alarm algorithms.

Main Methods:

• The DRS utilizes an electroplated alpha-emitting disk source and a rotating mask driven by a wristwatch motor.
• The rotating mask progressively reveals the source, simulating increasing airborne radioactivity over time.
• The system is designed for direct insertion into the filter chamber of standard CAMs.

Main Results:

• The DRS successfully mimics temporal release conditions (puff and chronic) without radioactive aerosols.
• It provides configurable, repeatable, and reusable testing without contaminating the CAM.
• Data generated aided in refining alarm algorithms and comparing the response times of commercial CAMs.

Conclusions:

• The Dynamic Radioactive Source offers a cost-effective, versatile, and safe method for evaluating continuous air monitors.
• This technology enhances in-house testing capabilities, allowing for direct user control and iterative algorithm development.
• The DRS represents a significant advancement in radiation detection system validation and performance assessment.