Detecting Hidden Radiation: A New Approach to Safety
Radiation workers encounter distinct challenges, particularly in identifying internal contamination. External contamination can often obscure internal issues, complicating accurate detection.
New Method Introduced Using Quick Scan Whole Body Monitor (QSWBM)
A recent study presents a novel approach to address this problem. The Quick Scan Whole Body Monitor (QSWBM) can detect external hotspots of Cesium-137, a prevalent radioactive isotope.
Computational Phantoms and FLUKA Code
The study utilized computational phantoms and the FLUKA code to assess various ratios of net count rates in the QSWBM detectors. Two critical ratios, R_D and R_AP, demonstrated effectiveness in screening different external hotspot scenarios.
- R_D: Compares net count rates in the upper and lower detectors during anterior counting.
- R_AP: Examines the ratio of net count rates in anterior and posterior counting.
In-Vitro Method for Accidental Contamination
In cases of widespread external contamination, the study recommends an in-vitro method. This involves analyzing urine samples with gamma spectrometry to accurately estimate internal contamination.
High-Purity Germanium (HPGe) Detection System
The High-Purity Germanium (HPGe) detection system was calibrated for different bottle sizes to ensure precise measurements.
Sensitivity and Accuracy
The study found that the Minimum Detectable Activity (MDA) values for this method are sensitive enough to quantify excretion rates leading to a Committed Effective Dose (CED) of less than 1 mSv, even up to 10 days after intake. This ensures accurate detection and measurement of low radiation levels.
Comprehensive Solution for Worker Safety
This new approach offers a reliable way to monitor radiation workers and ensure their safety. By combining whole body monitoring with in-vitro analysis, it provides a comprehensive solution for detecting both external and internal contamination.
