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Related Experiment Video

Updated: Mar 14, 2026

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities
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Gamma Putty dosimetric studies in electron beam.

Aime M Gloi1

  • 1Department of Radiation Onclogy, HSHS St. Vincent Hospital, Green Bay, WI, USA.

Journal of Medical Physics
|September 22, 2016
PubMed
Summary

Gamma Putty, a bismuth-loaded material, shows promise for radiation therapy field shaping. It effectively reduces radiation transmission for low-energy electron beams, protecting normal tissues.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Materials Science

Background:

  • Traditional use of lead for field shaping in megavoltage electron beams poses toxicity concerns.
  • Development of safer, effective alternatives for radiation therapy is crucial.

Purpose of the Study:

  • To evaluate the dosimetric properties of Gamma Putty, a novel bismuth-loaded material.
  • To assess its efficacy as a lead substitute for field shaping in electron beam radiation therapy.

Main Methods:

  • Ionization chamber measurements in a solid water phantom with varying Gamma Putty shield thicknesses (0-25 mm).
  • Analysis of relative ionization (RI) and dose profiles for electron beam energies (6-20 MeV).
  • Investigation of Gamma Putty's performance with different cutout diameters and beam energies.
Keywords:
Electron beam radiotherapyGamma Puttyexponential functiontransmission

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Main Results:

  • Bremsstrahlung radiation becomes dominant in Gamma Putty shields thicker than 15 mm.
  • Achieving <5% relative ionization is challenging for high-energy beams (12-20 MeV) due to bremsstrahlung.
  • Gamma Putty effectively reduces transmission to <5% for low-energy electron beams (6-9 MeV).

Conclusions:

  • Gamma Putty is a suitable, non-toxic alternative for field shaping in specific radiation therapy applications.
  • It offers significant potential for protecting normal tissues from radiation, particularly with lower energy electron beams.