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Rod phantom dimensions--does size matter?
Jens Brunzendorf1, Peter Ambrosi
1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany. Jens.Brunzendorf@PTB.de
Radiation Protection Dosimetry
|June 30, 2009
Summary
This study found that polymethyl methacrylate rod phantom dimensions within a +/- 1 mm diameter and 100 mm length are suitable for calibrating finger dosimeters. Variations within these parameters do not significantly impact calibration results.
Area of Science:
- Medical Physics
- Radiation Dosimetry
Background:
- The ISO 4037-3:1999 standard specifies a cylindrical polymethyl methacrylate (PMMA) rod phantom for extremity dosimeter calibration.
- The standard does not define tolerances for the phantom's dimensions, potentially affecting calibration accuracy.
Purpose of the Study:
- To investigate the impact of variations in rod phantom dimensions on the calibration of finger dosimeters.
- To determine acceptable dimensional tolerances for PMMA rod phantoms used in extremity dosimetry.
Main Methods:
- Thermoluminescence detectors (TLDs) were used as finger dosimeters.
- TLDs were attached to PMMA rod phantoms of varying dimensions.
- Irradiations were performed using PTB reference X-ray fields.
Main Results:
- Rod phantoms with a diameter of (19 +/- 1) mm and a minimum length of 100 mm showed calibration results equivalent to the standard.
- Calibration result variations remained below a 1% significance level within these dimensional tolerances.
- The phantom's edge effect on dosimeter response was negligible when the distance from the edge exceeded 10 mm.
Conclusions:
- PMMA rod phantoms with dimensions of (19 +/- 1) mm diameter and at least 100 mm length are suitable for finger dosimeter calibration.
- These findings provide practical guidance for ensuring accurate extremity dosimetry calibration.
- The study confirms the robustness of calibration procedures within specified dimensional ranges.
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