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ESTIMATION OF PERSONAL DOSE EQUIVALENT HP(0.07) USING CASO4:DY TEFLON DISC-BASED EXTREMITY DOSEMETER
Madhumita Bhattacharya1, Kasthuri Samuel1, Sandeep Patil1
1Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400 094, India.
Radiation Protection Dosimetry
|October 16, 2022
Summary
Indian radiation workers
Area of Science:
- Medical Physics
- Radiation Dosimetry
Background:
- Radiation workers in India utilize extremity dosemeters, with algorithms for whole body and wrist dose estimation currently using slab phantom calibration.
- International standards recommend different phantoms for extremity and whole body dosemeter calibration, with personal dose equivalent Hp(0.07) being the recommended quantity for extremity dose estimation.
Purpose of the Study:
- To develop and evaluate a new algorithm for estimating wrist dose in terms of Hp(0.07) using calibration on an ISO-recommended pillar phantom.
- To compare the performance of extremity dosemeters using slab versus pillar phantoms for photon and mixed field exposures.
- To assess the influence of phantom size and shape on dosemeter response for beta radiation.
Main Methods:
- Development of a new algorithm for wrist dose estimation based on pillar phantom calibration.
- Performance evaluation of the dosemeter with the new algorithm under various angular exposures of photon and mixed photon-beta fields.
- Comparative analysis of dosemeter performance using both slab and pillar ISO phantoms for photon and beta radiation.
Main Results:
- The new algorithm, calibrated on a pillar phantom, provides estimations of Hp(0.07) for extremity dosemeters.
- Comparison with slab phantom calibration revealed uncertainties in photon dose estimation.
- For beta radiation, dosemeter response showed minimal influence from phantom size and shape, with performance within ISO uncertainty limits except at a 60° angle.
Conclusions:
- The study highlights the importance of using appropriate phantoms, like the pillar phantom, for accurate extremity dose estimation.
- The developed algorithm and pillar phantom calibration offer improved accuracy for Hp(0.07) estimation.
- Findings underscore the need to re-evaluate current practices using slab phantoms for extremity dosimetry in India.
