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MIR dosimetry using CR-39 based α spectroscopy.

M Sreena1, E S Keerthi1, C V Midhun1

  • 1Nuclear and Radiation Physics Group, Department of Physics, University of Calicut, 673635, India.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|June 15, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for Medical Internal Radiation (MIR) dosimetry using CR-39 solid-state nuclear track detectors (SSNTD) for liquid sources. The technique accurately measures alpha spectra and estimates equilibrium dose for improved radiation safety.

Keywords:
Alpha spectroscopyCR-39Charged particle spectroscopyMIRDRadiopharmaceuticalsSSNTD

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Area of Science:

  • Nuclear Physics
  • Radiation Detection and Measurement
  • Medical Physics

Background:

  • Accurate internal radiation dosimetry is crucial for medical applications and radiation protection.
  • Existing dosimetry methods may have limitations for liquid sources.
  • Solid-state nuclear track detectors (SSNTDs) offer a promising alternative for radiation measurement.

Purpose of the Study:

  • To implement and validate the Medical Internal Radiation (MIR) Dosimetry formalism for a liquid source.
  • To establish a CR-39 SSNTD-based alpha spectroscopy method for liquid sources.
  • To accurately estimate the equilibrium dose from liquid radioactive sources.

Main Methods:

  • Utilized CR-39 SSNTD for alpha spectroscopy.
  • Developed a track diameter-brightness correlation to isolate alpha tracks from raw data.
  • Employed a cylindrical source model and Geant4 simulations to reproduce the measured alpha spectrum.
  • Convoluted the equilibrium alpha spectrum with stopping powers to estimate the equilibrium dose.

Main Results:

  • Successfully implemented MIR dosimetry formalism for a liquid source.
  • Established a reliable method for alpha track isolation and spectroscopy using CR-39 SSNTD.
  • Validated the measured alpha spectrum using established modeling and simulation techniques.
  • Quantified the equilibrium dose for the liquid source.

Conclusions:

  • The CR-39 SSNTD-based alpha spectroscopy is effective for MIR dosimetry of liquid sources.
  • The developed method provides accurate estimation of equilibrium dose.
  • This approach enhances radiation safety in medical and research settings involving liquid radioactive materials.