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Dosimetry for Cell Irradiation using Orthovoltage (40-300 kV) X-Ray Facilities
Published on: February 20, 2021
Radiation protection for an intra-operative X-ray device
D J Eaton1, R Gonzalez, S Duck
1Radiotherapy Physics, Royal Free Hospital, London, UK. davideaton@nhs.net
The British Journal of Radiology
|February 10, 2011
Summary
Shielding requirements for Intrabeam 50 kVp partial breast irradiation were investigated. Tungsten-rubber sheets, lead, plasterboard, and bricks effectively reduced radiation dose rates, ensuring staff safety during intra-operative treatments.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiological Protection
Background:
- Intra-operative partial breast irradiation utilizes the Intrabeam 50 kVp compact X-ray device.
- Spherical applicators create an isotropic radiation dose, with rapid attenuation due to low energy.
Purpose of the Study:
- To determine shielding requirements for the Intrabeam 50 kVp device.
- To assess the effectiveness of various shielding materials and configurations.
Main Methods:
- Attenuation measurements using tungsten-rubber sheets, lead, plasterboard, and bricks.
- Prospective environmental dose rate survey in the operating theatre.
- Construction and evaluation of lead screens for operator and vent shielding.
Main Results:
- Shielding sheets reduced the absorbed dose rate by 95%.
- Measured attenuation was comparable to 50 kVp diagnostic X-ray beams.
- Lead screens and aprons effectively reduced staff doses to negligible levels.
- Theatre should be a controlled area with restricted access.
Conclusions:
- Established shielding strategies are effective for Intrabeam 50 kVp treatments.
- Results and reference data can inform the planning of similar facilities.
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