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Updated: Mar 8, 2026
14:19
A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
Published on: February 1, 2016
9.0K
Measurement system for alpha and beta emitters with continuous air sampling under different exposure situations
Ryohei Yamada1, Yuki Tamakuma2, Kazuki Iwaoka3
1Hirosaki University Graduate School of Health Sciences, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
Summary
A new continuous radioactive aerosol measurement system (CRAMS) effectively monitors radioactive plumes and radon/thoron progeny. This system demonstrates reliable radon concentration tracking and a detection limit suitable for emergency response regulations.
Area of Science:
- Environmental Science
- Radiological Health
- Nuclear Safety
Background:
- Radioactive plumes pose significant risks during emergencies.
- Accurate monitoring of radon and thoron progeny is crucial for public health.
- Existing measurement systems may lack continuous monitoring capabilities.
Purpose of the Study:
- To develop a Continuous Radioactive Aerosol Measurement System (CRAMS).
- To enable real-time monitoring of radioactive plumes (e.g., 131I, 134Cs, 137Cs) during emergencies.
- To facilitate the measurement of radon/thoron progeny under normal conditions.
Main Methods:
- Development of a novel Continuous Radioactive Aerosol Measurement System (CRAMS).
- Testing CRAMS for its ability to track radon concentration variations.
- Evaluation of CRAMS detection limits according to ISO11929 standards under specific dose rates.
Main Results:
- The CRAMS successfully followed variations in radon concentration.
- The system's detection limit was determined to be 129 Bqm⁻³ under an ambient dose equivalent rate of 20 µSvh⁻¹.
- This detection limit aligns with Japanese regulations requiring temporary evacuation within one week.
Conclusions:
- The developed CRAMS is a viable tool for monitoring radioactive aerosols in emergency situations.
- The system provides reliable data for radon/thoron progeny assessment.
- CRAMS performance meets regulatory requirements for timely public safety measures.
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