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Intercomparison of whole-body counters using a multinuclide calibration phantom.
J D Fenwick1, A L McKenzie, K Boddy
1Regional Medical Physics Department, Newcastle General Hospital, UK.
Physics in Medicine and Biology
|February 1, 1991
Summary
UK whole-body counters were evaluated using a multinuclide phantom. This study ensured accurate radioactivity measurements and identified calibration issues in whole-body counting facilities.
Area of Science:
- Nuclear physics
- Medical physics
- Radiation detection
Background:
- Whole-body counters are crucial for assessing internal radioactive contamination in humans.
- Standardized methods are needed to ensure accuracy and comparability of measurements across different facilities.
- Existing phantoms may not adequately represent complex radionuclide distributions.
Purpose of the Study:
- To compare the performance of whole-body counters across the UK.
- To validate a novel multinuclide anthropomorphic phantom for radioactivity measurements.
- To identify and address calibration discrepancies in whole-body counting.
Main Methods:
- A modified Bush phantom was developed with channels for radionuclide sources.
- Urea-formaldehyde polymer encapsulated sources of Cesium-134, Cesium-137, and Potassium-40.
- The phantom was measured at 10 different whole-body counters in the UK.
Main Results:
- Median estimates from the counters showed close agreement with known activities.
- The phantom successfully simulated various radionuclide distributions.
- Specific calibration issues were identified for several counters.
Conclusions:
- The multinuclide anthropomorphic phantom is an effective tool for inter-facility comparisons.
- The study confirmed the general accuracy of UK whole-body counters.
- The technique aids in diagnosing and resolving calibration problems in radiation monitoring.