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Related Concept Videos

Biological Effects of Radiation02:59

Biological Effects of Radiation

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Updated: Sep 25, 2025

Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities
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Traceable dosimetry for MeV ion beams.

G Garty1, A D Harken1, D J Brenner1

  • 1Radiological Research Accelerator Facility, Columbia University, 136 S. Broadway, Irvington, NY 10533, U.S.A.

Journal of Instrumentation : an IOP and SISSA Journal
|May 2, 2022
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Summary
This summary is machine-generated.

Standard dosimetry protocols are inadequate for MeV-range ion beams. This study implements a NIST-traceable ionization chamber for accurate absorbed dose measurements, ensuring consistency with international standards for radiobiology research.

Keywords:
Detector alignment and calibration methods (lasers, sources, particle-beams)Dosimetry concepts and apparatusGaseous detectorsVery low-energy charged particle detectors

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Area of Science:

  • Medical Physics
  • Radiation Biology
  • Dosimetry

Background:

  • Existing dosimetry protocols are insufficient for shallow penetration MeV-range ion beams.
  • The Radiological Research Accelerator Facility has utilized custom dosimetry for cell irradiation for nearly 50 years.
  • A need exists to align in-house dosimetry with international standards.

Purpose of the Study:

  • To implement a commercial, NIST-traceable ionization chamber for dosimetry of low energy ions.
  • To adapt existing dosimetry protocols (TRS-398) for MeV-range ion beams.
  • To establish accurate absorbed dose to water measurements independent of ionization density.

Main Methods:

  • Implementation of a commercial, air-filled ionization chamber.
  • Calculation of radiation quality correction factors based on TRS-398 recommendations.
  • Measurement of absorbed dose to water for low energy ions.

Main Results:

  • Successful implementation of a NIST-traceable ionization chamber for MeV-range ion beams.
  • Absorbed dose to water measurements were obtained using calculated radiation quality correction factors.
  • The measured dose was independent of ionization density within the 10-150 keV/μm range.

Conclusions:

  • A reliable method for dosimetry of MeV-range ion beams has been established.
  • This approach aligns in-house dosimetry with international standards.
  • Accurate and consistent absorbed dose measurements are crucial for radiobiology research.