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A proposed multi-detector method for prompt 90Sr detection in post-accident environmental matrices
D Brini1, G Maltoni Giacomelli, M P Morigi
1Dipartimento Fisica, Università di Bologna, Italy.
Health Physics
|March 1, 1990
Summary
This study presents a multi-detector system for rapid Strontium-90 (Sr-90) activity evaluation after a nuclear accident. The system allows prompt determination of Sr-90 levels, crucial for environmental monitoring.
Area of Science:
- Nuclear Chemistry
- Environmental Science
- Radiation Detection
Background:
- Strontium-90 (Sr-90) is a biologically significant fission product.
- Accurate, real-time monitoring of Sr-90 in environmental samples is critical post-reactor accidents.
- Traditional methods require time for daughter equilibrium reestablishment.
Purpose of the Study:
- To assess the feasibility of a multi-detector system for prompt Sr-90 activity evaluation.
- To determine the order of magnitude of Sr-90 in environmental matrices rapidly.
- To analyze interferences from other beta and beta-gamma emitters.
Main Methods:
- Utilized a plastic scintillator beta detector.
- Employed a guard ring of BGO counters.
- Configured detectors for coincidence and anticoincidence logic.
- Examined interferences based on Chernobyl release data and decay properties.
Main Results:
- The developed system enables prompt evaluation of Sr-90 activity.
- A few hours of sampling (10 m3) are sufficient for determining activity near Maximum Permissible Concentration in air.
- Interference analysis was performed for relevant fission products.
Conclusions:
- The multi-detector system offers a feasible solution for rapid Sr-90 monitoring.
- Prompt determination of Sr-90 levels is achievable, reducing the need for lengthy equilibrium waiting periods.
- This technique is valuable for immediate environmental assessment following nuclear incidents.